1) Radium will form Ra²⁺ ions, because it is metal with two valence electrons (7s²) and it will lost two electrons to have electric configuration like noble gas radon (Z=86).
Electroic configuration of radium atom:
₈₈Ra 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²6p⁶7s².
2) Selenium wil form Se²⁻ ions, because it is nonmetal and it has six valence electrons (4s²4p⁴), it will gain two electrons to have electron configuration like noble gas krypton (Z=36).
Electronic configuration of selenium atom: ₃₄Se 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁴.
Radium typically loses 2 electrons to form Ra2+ ion, while Selenium typically gains 2 electrons to form Se2- ion. Thus, Ra2+ and Se2- are their respective monatomic ions.
Explanation:Radium (Z = 88) is in group 2 of the periodic table and therefore tends to lose 2 electrons to form Ra2+ (Radium ion) to achieve a stable electron configuration. Selenium (Z = 34), on the other hand, is in group 16 of the periodic table and therefore it typically gains 2 electrons to form Se2- (Selenium ion) to reach a stable electron configuration similar to the nearest noble gas. These ions, Ra2+ and Se2- are monatomic ions because they consist of only one atom.
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Classify each example as an element a compound a heterogeneous mixture or a homogeneous mixture a pure drinking water
Substances are classified based on their chemical composition into elements (e.g., gold), compounds (e.g., salt, pure water, carbon dioxide), homogeneous mixtures (e.g., salt water, pure air), and heterogeneous mixtures (e.g., soil, bronze).
Explanation:Classification of SubstancesSubstances can be classified into four main categories based on their chemical composition: elements, compounds, homogeneous mixtures, and heterogeneous mixtures. The classification for each of the given substances is as follows:
Salt (sodium chloride): CompoundPure water (H2O): CompoundSoil: Heterogeneous mixtureSalt water: Homogeneous mixture (solution)Pure air: Homogeneous mixture (solution)Carbon dioxide (CO2): CompoundGold (Au): ElementBronze: Heterogeneous mixtureAn element is a pure substance that cannot be broken down into simpler substances. A compound is a pure substance that consists of two or more elements chemically combined in a fixed ratio. A homogeneous mixture, or solution, has uniform composition throughout, whereas a heterogeneous mixture has a composition that varies from point to point.
For heavy elements, what is the ratio of neutrons to protons that predicts a stable nucleus?
a) 1:1
b) 1.5:1
c) 2:1
d) 10:5
For heavy elements the ratio of neutrons to protons that predicts a stable nucleus is 1 .5 : 1
The correct option is b. 1.5 : 1
a) 1:1
b) 1.5:1
c) 2:1
d) 10:5
What are the different ways to represent compounds? check all that apply. check all that apply. the kolbe formula a structural formula a ball model an empirical formula a space-filling model a molecular formula a ball and stick model a cylindric model?
Compounds can be exemplified in two main ways. These are Chemical Formula and Molecular Model.
Chemical formula includes:
Structural formula – this is a formula that shows the arrangement of atoms in the molecule of a compound.
Molecular formula – this is a formula giving the number of atoms of each elements to present in one molecule of a specific compound.
Empirical formula – this is a formula giving the proportions of elements present in a compound.
Molecular model:
Space-filling model - represents atoms fill the space between each other.
Ball and stick model - represents atoms as balls and chemical bonds as sticks.
Remember that a compound is a substance that is formed when two or more elements are bonded together.
Compounds can be represented in several ways including Molecular Formulas, Empirical Formulas, Structural Formulas, Ball-and-Stick Models, and Space-Filling Models. Each method provides different levels of detail and helps us understand the composition and structure of chemical compounds.
Explanation:Compounds can be represented in several ways: Molecular Formulas, Empirical Formulas, Structural Formulas, Ball-and-Stick Models, and Space-Filling Models.
Molecular formulas use chemical symbols and subscripts to indicate the exact numbers of different atoms in a molecule or compound. For instance, the molecular formula for water is H2O, indicating there are two hydrogen atoms and one oxygen atom.
Empirical formulas give the simplest whole-number ratio of atoms in a compound. For water, the empirical formula would still be H2O.
Structural formulas indicate the bonding arrangement of the atoms in the molecule, giving more detailed information about the molecule's structure.
Ball-and-stick models show the geometric arrangement of the atoms in a molecule with atomic sizes not to scale. These models often use balls to represent atoms and sticks to represent chemical bonds.
Lastly, Space-filling models also show the geometric arrangement of atoms, but in these models, the relative sizes of the atoms are represented accurately and the model gives a more realistic view of the molecule's shape.
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If heat is absorbed by water, what phase change occurs?
A) gas to solid
B) liquid to gas
C) liquid to solid
D) solid to liquid
What is the approximate percentage of corn syrup that would make an isotonic solution for the egg?
What choice is not a characteristic of a catalyst?
How can chemistry help you make wiser decisions and be a better consumer?
How many joules of energy are necessary to heat a sample of water with a mass of 46.0 grams from 0.0 Celsius to 100.0 Celsius? (Use 4.184 J/g Celsius for the specific heat of water.)
Type the correct answer to 3 significant digits. If the answer has an exponent, type the number, then ^, then the exponent.
(The question is on the picture.)
What experimental evidence did thomson use to support his hypothesis that atoms of all elements are made up of even smaller, charged particles?
Answer is: Identical particles were produced no matter which metal he used.
J.J. Thomson placed two oppositely charged electric plates around the cathode ray. He did experiments using different metals as electrode materials and found that the properties of the cathode ray remained constant no matter what cathode material he used.
Tomson concluded that atoms are divisible and that the corpuscles are their building blocks (atoms are made up of smaller particles).
J. J. Thomson discovered the electron in 1897.
His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.
With this model, he abandoned his earlier hypothesis (the atom was composed of immaterial vortices).
When nitrogen and tin (sn4+) form an ionic compound, what is the formula? n3sn4 sn4n3 sn3n4 n4sn3?
Report your answer with the proper number of significant figures. magnesium is used in lightweight alloys for airplane bodies and other structures. the metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and electrolysis. how many kilograms of magnesium can be obtained from 8.01 km3 of seawater if the initial mg2+concentration is 0.12% by mass? (d of seawater = 1.04 g/ml)
The density given is 1.04 g/mL, or also equivalent to:
density = 1040 kg/m^3
The total mass of seawater is calculated by multiplying density and volume. conversion factor is 1 km = 1000 m:
total mass = (1040 kg/m^3) * (8.01 km^3) * (1000 m / 1 km)^3
total mass = 8.3304 x 10^12 kg
Since Mg2+ is 0.12% by weight, in fraction this is 0.0012 by weight. So:
mass Mg2+ = (8.3304 x 10^12 kg) * 0.0012
mass Mg2+ = 9.996 x 10^9 kg
What is covalent bonding
The density of silver is 10.5 g/cm3. what volume would a piece of silver with a mass of 54.5 g occupy?
How many moles of oxygen (O) atoms are in a sample of 3.98 × 1023 atoms?
Answer : The number of moles of oxygen atoms present in a sample is 0.661 moles.
Explanation :
As we know that,
1 mole of substance contains [tex]6.022\times 10^{23}[/tex] number of atoms.
As we are given that:
Number of oxygen atoms = [tex]3.98\times 10^{23}[/tex]
Now we have to determine the moles of oxygen atoms.
As, [tex]6.022\times 10^{23}[/tex] atoms of oxygen present in 1 mole of oxygen
So, [tex]3.98\times 10^{23}[/tex] atoms of oxygen present in [tex]\frac{3.98\times 10^{23}}{6.022\times 10^{23}}=0.661[/tex] mole of oxygen
Therefore, the number of moles of oxygen atoms present in a sample is 0.661 moles.
A gas mixture contains rn, he and n2. what is the total pressure of the mixture, if the mole fraction of n2 is 0.350 and the pressure of n2 is 0.580 atm?
We can solve this problem using Raoults law. The formula for Raoults law is:
P_a = X_a * P
where,
P_a = the partial pressure of substance A
X_a = the mole fraction of substance A
P = total pressure
Therefore calculating for P:
P = P_a / X_a
P = 0.580 atm / 0.35
P = 1.657 atm
0.52 on edg 2020
Explanation:
An atom of gold has a mass of 3.271 x 10^-22g. how many atoms of gold are in 5.00g of gold?
Answer:
number of gold atoms = [tex]1.528X10^{22}[/tex]
Explanation:
The mass of one atom of gold is given to be = [tex]3.271X10^{-22}[/tex]
The mass of gold is given to be = [tex]5.00g[/tex]
In order to determine the number of atoms present in the 5 g of gold, we will divide the mass of the gold with the mass of each atom of the gold.
the number of atoms = [tex]\frac{massofgold}{massofatom}=\frac{5}{3.271X10^{-22}} =1.528X10^{22}[/tex]
Thus number of gold atoms = [tex]1.528X10^{22}[/tex]
Arrange the orbitals in the order in which they fill and indicate the maximum number of electrons each can hold.
Answer:
Explanation:
We can fill maximum two electrons in one orbital. The s subshell has 1 orbital that can filled upto two electrons, the p subshell has 3 orbitals that can filled upto six electrons, the d subshell has 5 orbitals that can filled upto ten electrons, the f subshell has 7 orbitals that can filled upto fourteen electrons.
According to the energy level diagram, the 2p, 3p, 4p each can hold 6 electrons because they have 3 orbitals, and 3d, 4d each can hold 10 electrons because they have 5 orbitals, the 5f, 6f, each can hold 14 electrons because they have 7 orbitals. Therefore, the maximum number of electrons would be present in f subshell or 6f orbital.
Anyone wanna help me in chem?? PLEASE
____ is a set of rules that describes how atoms and subatomic particles behave.
The total number of protons and neutrons and eletronc in an stom aliver 109 is
Sulfur and oxygen form both sulfur dioxide and sulfur trioxide. When samples of these are decomposed, the sulfur dioxide produces 3.45 g oxygen and 3.46 g sulfur, while the sulfur trioxide produces 9.00 g oxygen and 6.00 g sulfur. Calculate the mass of oxygen per gram of sulfur for sulfur dioxide. (IT HAS BEEN 2 YEARS SO I DID THIS, I NEED HELP :( )
To calculate the mass of oxygen per gram of sulfur for sulfur dioxide, determine the molar masses of sulfur and oxygen in each compound and use the given masses of oxygen and sulfur to calculate the ratio.
Explanation:To calculate the mass of oxygen per gram of sulfur for sulfur dioxide, we need to find the molar masses of sulfur and oxygen in each compound. The molar mass of sulfur dioxide is 32.06 g/mol for sulfur and 2 x 16.00 g/mol for oxygen, while the molar mass of sulfur trioxide is 48.06 g/mol for sulfur and 3 x 16.00 g/mol for oxygen. Using the given masses of oxygen and sulfur for each compound, we can then calculate the mass of oxygen per gram of sulfur.
For sulfur dioxide:
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Which of these orbital designations are invalid? 13.2
a. 4s
b. 3f
c. 2d
d. 3d?
The orbital designations 4s, 3f, and 2d are valid, while 3d is not valid.
Explanation:The orbital designations 4s, 3f, and 2d are valid, while 3d is not valid.
The first part of the orbital designation represents the principal quantum number, which indicates the energy level of the electron. The numbers 1, 2, 3, 4, etc. are all valid principal quantum numbers. So the designations 4s, 3f, and 2d are all valid.The second part of the orbital designation represents the shape of the orbital. The letters s, p, d, and f represent different shapes. However, the letter d represents the shape of the d orbital, not the shape of the 2d orbital. Therefore, 2d is an invalid designation.Lastly, the third part of the orbital designation represents the magnetic quantum number, which indicates the orientation of the orbital. The numbers 0, 1, -1, 2, -2, etc., are all valid magnetic quantum numbers. So the designations 4s, 3f, and 3d are all valid.Learn more about Invalid Orbital Designations here:https://brainly.com/question/35869963
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In the context of atomic structure, the invalid orbital designations are 3f and 2d. At the third energy level, 'd' subshell exists but 'f' doesn't. Similarly, at the second energy level, 'd' subshell doesn't exist. Option b and c
Explanation:In quantum mechanics, orbital designations are used to describe the location and properties of electrons within atoms. They consist of a number that represents the energy level of the electron, and a letter that represents the shape of the orbital (subshell).
Each kind of subshell (represented by s, p, d, f, and continuing onwards alphabetically) exists only from a certain energy level onwards.
The 's' subshell exists from energy level 1 onwards, so 4s is valid.
The 'p' subshell exists from energy level 2 onwards.
The 'd' subshell exists from energy level 3 onwards, so 3d is valid.
The 'f' subshell exists from energy level 4 onwards, so 3f is invalid.
Therefore, orbital designations 3f and 2d are invalid because 'f' and 'd' sublevels do not exist at the 3rd and 2nd energy levels, respectively.
Option b and c
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Where are the alkali metals and alkaline earth metals and halogens and noble gases located in the periodic table?
An element belonging to the halogen family would be expected to have a ________ ionization energy and a ________ electron affinity.
If a liter of water has a mass of one kilogram, and a liter of mercury has a mass of 13.6 kilograms, which is more dense and why
Density is the amount of matter within a given amount of space.
Water has a density of 1.0 gram per centimeter squared.
Mercury has a density of 13.6 grams per centimeter squared.
Thus, within the same volume, mercury has more mass than water. Thus, mercury has a higher density.
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Mercury is more denser than water.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the substance ÷volume of substance
From above formula we can see that density is directly proportional to mass of substances at constant volume.
The volume of water and mercury is same that is 1 liter. Since the mass of mercury that is 13.6 kilograms is more than mass of water that is 1 kilogram. So, the density of mercury is more than the density of water which means mercury is denser than water.
Therefore mercury is more denser than water.
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What is the correct scientific notation for 640,000,000? Question 5 options: 6.4X10^8 6.4X10^10 64X10^10 640X10^8
A researcher wants to study monkeys in their natural habitat, out in the wild. What type of qualitative research method is best to use?
longitudinal
observational
case study
cross-sectional
Answer: Observational
Explanation:
The method in which there is a observation of characters without being interfering into their natural processes is known as observational qualitative research.
There are many different types of research method which uses different techniques or experiments to find the desired result.
In this case the moneys are observed in their habitat without being interfering into their habitat. How they walk, how they react, how they eat and many more circumstances are observed only.
Why are group 1 elements more reactive than group 2 elements?
The reasoning for this is that it is more difficult to lose two electrons compared to losing just one electron.
Why is group 1 the most reactive?Group 1 of the periodic table includes hydrogen and alkali metals. Because they have just one valence electron, group 1 elements are very reactive.
Why are the elements in groups 1 and 2 highly reactive?Alkali metals are among the most reactive metals in the periodic table and this is due to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. 4.
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Element that has two isotopes has an average atomic mass of 199.7. if 75.56% of the atoms of the element have an atomic mass of 197.4, what is the atomic mass of the other isotope?
mercury has a mass density of 13.54 g/ml . how many milliliters would 100. grams occupy
The mass of mercury is divided by density.
100 g / 13.54 g/ml = 7.3855 ml
Since, we only have 3 significant digits in 100 and round the result to 3 significant digits. So, 7.3855 ml = 7.39 ml.
How can we calculate the mass from density and volume?Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density. The S.I unit of density is kg/m^3 and in C.G.S it is gram/cm^3.
So In above question can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily. The S.I unit of density is kg/m^3 and in C.G.S it is gram/cm^3.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unti of mass is kilograms and C.G.S unit is gram.
Therefore, The mass of mercury is divided by density.
100 g / 13.54 g/ml = 7.3855 ml
Since, we only have 3 significant digits in 100 and round the result to 3 significant digits. So, 7.3855 ml = 7.39 ml.
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