Question

Explain the term valence electrons.​

Answer 1

Explanation:

The valence electrons are the electrons which are present in the last shell of an atom and are left unpaired.

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Answer 2

Answer:

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Valence is the number of electrons an atom must lose or gain to attain the nearest noble gas or inert gas electronic configuration. “Electrons in the outer shells that are not filled are called valence electrons”.

The valence electrons are part of most of the chemical reactions because they contain more energy compared to the electrons present in inner orbits. Meanwhile, the number of valence electrons present also helps us determine a specific element’s chemical properties, such as its valence or valency, the formation of bonds with other elements. It also gives us an idea of how readily the atoms can form bonds, the number of unpaired electrons and how many atoms can take part.

Characteristics of Valence Electron

Electrons are involved in the chemical bonding and reactions of the atom. It is said to occupy orbitals in an atom. The number of valence electrons of an atom can be obtained from the periodic table because it is equal to the group number of the atom. Atoms are most stable if they have a filled valence shell of electrons. Atoms transfer or share electrons in such a way that they can attain a filled shell of electrons.

Some key characteristics of a valence electron are;

• For the main group elements, the valence electron exists only in the outermost electron shell.

• A valence electron can exist in the inner shell of a transition metal.

• An atom consisting of a closed shell of valence electrons will usually be chemically inert.

• A valence electron can either absorb or release energy in the form of a photon.

• Valence electrons also determine the electrical conductivity of an element. Depending on in this nature of elements can be a metal, non-metal, or a metalloid.

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