Question

atomic number of an element is 18 . what is its valency and valence electrons??

Answer 1

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Argon Atomic Number =18
Valence Electrons = 8
Valency = 0


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Answer 2

The valency is 0 and the valance electron is 8.

• The atomic number of an element is 18. The element is Argon. It is a Nobel gas.
• The electronic configuration of Ar is as follows-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6}$
• Thus it has a filled orbital. So, it is highly stable. Thus its valency is zero.
• Again its valance shell that is the 3s and 3p shell has a total of eight electrons. So, its valance electrons are 8.