Question

Amongst element X (2,8,6) and Y (2,8,8) which is more reactive and why?

• A. X because it is a metal
• B. Y because it is non metal
• C. X because it has 6 valence electrons
• D. Y because it is gas

Answer 1

The correct option is C X because it has 6 valence electrons

$X(2,8,6)$

Valence shell is the outermost shell which contains valence electrons.

In $X(2,8,6)$ there are $6$ electrons in valence shell and it is short of $2$ electrons to complete octet.

While in $y(2,8,8)$ it has fully filled valence shell and will not gain, loose or share electron with other element.

Hence, $x$ is more reactive than $y$.