How many lone pairs of electrons are in the electron-dot structure of h2o?

Answer: Option (D) is the correct answer.

Explanation:

It is known that elements which belong to same group show similar chemical properties.

This is because elements which lie in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.

For example, Be, Mg, Ca and Sr are all group 2 elements. Hence, they tend to show similar chemical properties.

Thus, we can conclude that out of the given options Be, Mg, Ca elements have properties similar to those of strontium (Sr).

The quantity of valence electrons in an element's outermost atomic shell lies in what determines that element's valency. For all elements in the same group, the electrical configuration of the outermost shell is the same. Here the correct option is D.

The quantity of valence electrons in an element determines its physical and chemical properties. The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are comparable.

Be, Mg, Ca and Sr are all group 2 elements. Hence, they tend to show similar chemical properties.

Thus, we can conclude that out of the given options Be, Mg, Ca elements have properties similar to those of strontium (Sr).

Thus the correct option is D.

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Answer:

It's D.

Explanation:

Trust me.

Answer : Electrons.

Explanation : The subatomic particle which is responsible for combining the atoms together to form a new substance is ELECTRON.

Electrons are negatively charged tiny particles which are found outside the nucleus and is one of the three subatomic particles. These are responsible for formation of new substance through transfer or sharing of electrons between the atoms of the elements. Mainly the outermost revolving electrons are the ones which undergoes transformation and forms new substance. It influences many physical and chemical properties of the substances.

Final answer:

The atomic number on the periodic table indicates the number of protons in the nucleus of an atom of that element, defining its identity. This number is usually found at the top of the element's square on the table, allowing for easy identification and distinction between elements.

Explanation:

The atomic number on the periodic table tells you the number of protons found in the nucleus of the atom of that element. Each element on the periodic table has a unique atomic number, which is usually displayed at the top of the element's square.

This number is crucial because it defines the identity of the element; for instance, hydrogen has an atomic number of 1, meaning all hydrogen atoms have 1 proton in their nucleus. Similarly, helium has an atomic number of 2, indicating that every helium atom has exactly 2 protons in its nucleus.

The periodic table arranges elements in increasing atomic number, and this is the characteristic that makes each element unique compared to all others.

By looking at the periodic table, you can determine the atomic number of an element, and thus know how many protons its atoms contain. This makes the periodic table an indispensable tool for scientists and students alike.

Answer:

Mg2+

Explanation:

The chemical name for a compound with the formula Ba3N2 is barium nitride.

Barium nitride is composed of the element barium (Ba) and the element nitrogen (N). The subscript "3" indicates that there are three barium atoms, and the subscript "2" indicates that there are two nitrogen atoms in the compound.

The naming of ionic compounds, such as barium nitride, follows a specific pattern. The name of the cation (positively charged ion) is stated first, followed by the name of the anion (negatively charged ion).

Thus, the name "barium nitride" accurately describes the composition of the compound Ba3N2, indicating that it consists of three barium atoms and two nitrogen atoms bonded together.

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Nucleosynthesis is the stellar process in which the fusion of hydrogen produces other elements, such as helium. This process occurs through the proton-proton chain reaction in stars like the Sun.

The stellar process in which the fusion of hydrogen produces other elements is called nucleosynthesis. During nucleosynthesis, hydrogen nuclei (protons) combine to form helium nuclei in a process known as the proton-proton chain reaction. This is an important example of nuclear fusion that occurs in the Sun and other stars, and it is responsible for the production of energy and the creation of heavier elements.

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When atoms loose or gain electrons  in chemical reactions they form ions on loosing electrons they form cations and on gaining electrons they form anions.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created  by chemical interactions . They are very reactive in their gaseous state  and rapidly react with oppositely charged ions  resulting in neutral molecules.

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Answer:

The correct answer is option C, that is, andesitic.

Explanation:

Andesite is the term used for a fine-grained extrusive rocks family, which are generally light to dark gray in appearance. They generally weather to different shades of brown. Andesite mostly comprises plagioclase feldspar minerals and may also comprise pyroxene, biotite, or amphibole as the dark silicate minerals. It generally does not comprise olivine or quartz.