Question

Two elements with symbol X (atomic number 16) and Y (atomic number 12) are placed in the third Period of the modern periodic table

(i) Which amongst the two has more metallic character?

(ii) Calculate the valency of each element?

(ii) Elements Y is smaller than X in terms of atomic size. Is the statement true, justify.
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Answer 1

answer:

1. Y

2.X->2

Y->2

but Y is metal and X is non metal.

so valency of X is +2 and that of Y is - Y.

Answer 2

Answer:

Y IS MAGNESIUM AND X IS OXYGEN

i)Y HAS MORE METALLIC CHARACTER AS THE METALLIC CHARACTER DECREASES WHEN WE GO FROM LEFT TO RIGHT ACROSS A PERIOD

ii)X ELECTRONIC CONFIGURATION = 2,8,6

Y ELECTRONIC CONFIGURATION = 2,8,2

VALENCY OF X = 8-6 = 2

VALENCY OF Y = 2

iii)NO THE STATEMENT IS NOT TRUE BECAUSE THE ATOMIC SIZE DECREASE WHEN WE GO FROM LEFT TO RIGHT ACROSS THE PERIOD.

Explanation: