Question

what is valency and it's valence electrons
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Answer 1

Answer: Define Valency

The combining capacity of an atom is known as its valency. ... We all know how electrons in an atom are arranged in shells/orbitals. Valence electrons are those electrons which are present in the outermost orbit of the atom

                                               What is called valency?

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

Explanation:                                 What is valency example?

For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one. For example, H →1; Mg→2; Al→3; C→4; N→3, and 5; P→3 and 5; O→2; S→ 2, 4 and 6; Cl→ 1; and Ne→0.

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Answer 2

The electrons present in the outermost shell of an atom are known as valence electrons (or valency electrons) because they decide the valency (combining capacity) of the atom.

For example - The atomic number of sodium is 11, which means sodium atom has 11 electrons in it.

So the electronic configuration K(2), L(8), M(1)

In the sodium atom, M shell is the outermost shell or valence shell.

There is 1 electron in the outermost shell of sodium atom, therefore, sodium atom has 1 valence electorn.

Those electrons of an atom which take part in chemical reactions are called valence electrons.

Valence electrons are located in the outermost shell of an atom.

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