Question

Given below are the melting point and the atomic radii of three elements X, Y & Z each having an electron in the valence shell of their atom:

Element	X	Y	Z
M.P(${}^{o}C$)	1.54	1.96	1.34
ATOMIC RADIUS($\stackrel{o}{A}$)	1.31	1.36	1.20

a) Will the valencies of the elements be the same or different? Why?
b) Which element will have the highest atomic number? Why?
c) Arrange the element in decreasing order of their metallic character.

Answer 1

According to the atomic radius,

elements can be arranged as-

$Y>X>Z$

(a) Given the each element has an $e^{-}$ in the outermost shell. $\because$ They have same number of $e^{-}$ in the outermost shell. $\therefore$ , they belong to the same group.

(b) Element with highest atomic radii will have highest atomic no. i.e. $Y$.

(c) As we have inferred above the atomic radii is in the order $Y>X>Z$. So, metallic character order is also the same, i.e. $Y>X>Z$.