Which atom in the ground state requires the least amount of energy to remove its valence electron?

An atom of aluminum with a mass number of 26 and an atomic number of 13 has a total of 13 protons and electrons  and 13 neutrons.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Final answer:

The term used to describe the capacity of long-term memory is 'unlimited' or 'limitless' due to its potentially infinite capacity for storing information for extended periods.

Explanation:

The term used to describe the capacity of long-term memory is unlimited or limitless. Long-term memory (LTM) is a type of memory storage that can hold information for extended periods, ranging from days to years. Long-term memory differs from short-term memory in that it possesses a potentially infinite capacity; there is no known limit to what we can remember. Although the ability to retrieve information from LTM can be affected by various factors, such as consolidation and interference, the storage capacity itself is considered vast.

Final answer:

To calculate the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the mole ratio from the balanced chemical equation. From the given information, the moles of iron and oxygen are 0.894 mol and 1.3125 mol, respectively. Using the mole ratio of 4 moles of iron to 2 moles of iron oxide, we can calculate that 0.447 mol of iron oxide is formed. Finally, converting moles to grams, we find that 71.26 g of iron oxide is produced.

Explanation:

To determine the grams of iron oxide formed, you need to calculate the moles of iron and moles of oxygen in the reaction and use the balanced chemical equation to determine the mole ratio. From the given information, the molar mass of iron is 55.845 g/mol and the molar mass of oxygen is 16.00 g/mol. The balanced chemical equation for the reaction is:

4Fe + 3O₂ → 2Fe₂O₃

Using stoichiometry, we can calculate the moles of iron and oxygen:

Moles of iron = (50 g iron) / (55.845 g/mol) = 0.894 mol

Moles of oxygen = (21 g oxygen) / (16.00 g/mol) = 1.3125 mol

From the balanced chemical equation, we can see that the mole ratio of iron to iron oxide is 4:2. Therefore, for every 4 moles of iron, we get 2 moles of iron oxide. So, the moles of iron oxide formed in the reaction is:

Moles of iron oxide = (0.894 mol iron) / (4 mol iron) * (2 mol iron oxide) = 0.447 mol iron oxide

Finally, we can calculate the grams of iron oxide:

Grams of iron oxide = (0.447 mol iron oxide) * (159.69 g/mol) = 71.26 g iron oxide

Specific heat equation is given as

[tex]Q =m\times c\times \Delta T[/tex]

where, Q = energy required

m = mass

c = specific heat

[tex]\Delta T[/tex] = change in temperature

Specific heat of silver ([tex]Ag[/tex]) is [tex]0.245 J/^{o}C g[/tex]

Mass of silver  = 350 g

[tex]\Delta T =T_{final}-T_{intital}[/tex]

Convert 400 K to degree Celsius = 400-273 = 127 K

Convert 293 K to degree Celsius = 293-273 = 20 K

Thus, [tex]\Delta T =127 K-20 K[/tex]

=   [tex]107^{o}C[/tex]

Put the values,

[tex]Q =m\times c\times \Delta T[/tex]

[tex]Q = 350 g\times 0.245 J/^{o}C g\times(107^{o}C)[/tex]

= 9175.25 J

Hence, energy required to raise the temperature is 9175.25 J

Answer:

The macroscopic appearance is different.

Explanation:

The two (solution) and heterogeneous mixture are actually mixtures. These are made up of one of two pure substances in gaseous and liquid phases.

However, the difference lies in the macroscopic level of the particles.

A heterogeneous mixture is made of different substances. For example, when powdered milk is added to water, the mixture is a white substance, or colloidal mixture. The mixture is a heterogeneous in the sense that is all liquid; however, the mixture is not the same color as water. Thus, there is not complete dissolution.  

A solution is the same throughout. An example is dissolving sugar into water. The solution is colorless throughout. The difference is that the sugar and water have formed a solution whose properties are not visible to the naked eye.

Answer is: 1 × 10⁻¹⁰ meter or 0.0000000001 meter.

The atomic radius is a measure of the size of the atom.

It is distance from the center of the nucleus of atom to the boundary of electron cloud.

The radius of atoms is between 30 and 300 pm (10⁻¹² m)  or between 0.3 and 3 angstroms (10⁻¹⁰ m). 

The radius generally decrease along each period of the Periodic table.

Explanation:

It is known that an atom consists of protons, neutrons and electrons. Both protons and neutrons are located inside the nucleus of an atom whereas electrons revolve around the nucleus.

Atomic number is the total number of protons present in an atom. On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.

That is,     Atomic mass = no. of protons + no. of neutrons

                 no. of neutrons = atomic mass - no. of protons

Therefore, we can conclude that to find the number of neutrons in an atom, subtract its number of protons from atomic mass.

TRUE is the perfect answer

A balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].

Elements are defined as a substance that is entirely made up of the same kind of atoms, all of which have the same amount of protons in their nuclei. Every element has characteristics. Conductivity, magnetism, melting and boiling points, color, state of matter, and other characteristics are among these. The periodic table of elements is divided into sections, each of which contains groups of elements having related properties.

Balanced equation is defined as a chemical equation where the amount of each element's atoms on each side of the equation is equal and the mass is preserved. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.

Thus, a balanced equation for the formation of one mole of NaCl (aq) from its elements is [tex]\rm2Na + Cl_2 \rightarrow 2NaCl[/tex].

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To find the mass of MgI2 produced in the reaction between Mg and I2, you need to calculate the moles of Mg and I2 and use the mole ratio from the balanced equation. Finally, convert the moles of MgI2 to grams using the molar mass of MgI2.

In this reaction, the balanced equation is 2Mg + I2 → 2MgI2. From the balanced equation, we can see that 2 moles of Mg react with 1 mole of I2 to produce 2 moles of MgI2. To find the mass of MgI2 produced, we need to calculate the moles of Mg and I2 and then use the mole ratio to determine the moles of MgI2. Finally, we can convert the moles of MgI2 to grams using the molar mass of MgI2.

Given: m(Mg) = 5.15 g, m(I2) = 50.0 g

Molar mass of MgI2 = 278.113 g/mol

Using these steps, you can determine the mass of MgI2 that can be produced from the given masses of Mg and I2.

Final answer:

Sodium ion and potassium ion are the two ions that are most likely to bond due to their positive charges.

Explanation:

The two ions that are most likely to bond are sodium ion and potassium ion. Both sodium and potassium are alkali metals in Group 1 of the periodic table and have a single electron in their outermost energy level. When they lose this electron, they form positively charged ions (cations). Since sodium has a +1 charge and potassium has a +1 charge, these ions are attracted to each other through electrostatic forces, forming a bond.

Answer:

Radioactive dating

Explanation:

Final answer:

Mars is approximately 227.5 million kilometers from the Sun.

Explanation:

Mars is approximately 1.52 astronomical units (AU) from the Sun. Given that the average distance between the Earth and the Sun is about 149.6 million kilometers, we can calculate the distance from Mars to the Sun. Since 1 AU is equivalent to about 149.6 million kilometers, we can multiply 1.52 AU by 149.6 million kilometers to find that Mars is approximately 227.5 million kilometers from the Sun.

the answer is 4.3.....

Limestone is the most prevalent type of chemical sedimentary rock. Calcite, also known as calcium carbonate, is the main component of limestone and has the chemical formula CaCO3.

The formation of sedimentary rocks involves the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. The processes that lead to the accumulation of these particles are collectively referred to as sedimentation.

Clastic, organic (biological), and chemical sedimentary rocks are the three different types of sedimentary rocks. Sandstone is a type of clast sedimentary rock, which is formed from fragments of other rocks.

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The elements 90 to 103 on the periodic table are called the Actinide series. They are part of the 'f-block' and are all radioactive. Some well-known actinides are Uranium and Plutonium.

The elements numbered 90 to 103 on the periodic table are known as the Actinide series. These elements, which include Th (Thorium, 90) to Lr (Lawrencium, 103), are part of the 'f-block' and are often shown separately from the main body of the periodic table.

It is important to note that all of the actinides are radioactive, and some are not naturally occurring but synthesized in laboratories. The most well-known of these is probably U (Uranium, 92) and Pu (Plutonium, 94), commonly used in nuclear reactors and weapons.

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