Question

What Valency will be shown by an element having atomic number 18​

Answer 1

Explanation:

ARGON AR is the element having atomic number 18.

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Answer 2

Answer:

0 (Argon=18)

Explanation:

Let us first check the electronic configuration of the element.

Since it's atomic number is 18, it's electronic configuration can be written (as per K,L,M,N shell format),

2,8,8

Here the outermost shell has eight electrons, and hence it follows the octet rule of eight electrons being in the valence shell (outermost shell) for the atom to attain stability.

Hence it's valency is 0, because

1) It is a noble gas when it is stable as well as electrically neutral [The state in which the number of protons and electrons are equal, giving the atom a neutral charge, or no charge]

2) Since valency is defined as the combining capacity of an atom, and Noble gases don't react, they do not have a valency

Guessing the element, it is Argon, which belongs to the Noble Gas Group in Period 3.

I've given enough explanations. Thanks for reading!!!