Question

If the atomic number of an atom is 18 what is it valency

Answer 1

Answer :


Atomic No. = No. of Electrons = No. of Protons

So, we can conclude that the element has 18 electrons in total.

Now, Electronic Configurationof the element :

K         L          M
2          8          8

That is, the element is configured as (2,8,8).

♦ Thus, valence electrons (electrons in outermost shell) = 8

The element can be stable by being octant, i.e, having 8 electrons in valence shell. 

For that, it must gain no electron.

Therefore, 

♦ Valency = 1

PLEASE MARK MY ANSWER AS A BRAINLIEST.


HAPPY NEW YEAR 2019

Answer 2

For this atom the atomic configuration is : 2,8,8

The outermost electron is eight that means the electron is stable .

So, the valency of this electron is 0 because this atom doesn't need any electron to become stable.