Question

The electronic configuration of an element X is 2, 8, 1 and element Y is 2, 8, 18, 8, 1. 

i. Identify the group of X and Y. 

ii. What is the period number of Y? 

iii. How many valence electrons are there in the atoms of X and Y? 

iv. What is the valency of X and Y? 

v. State whether X and Y are metals or non-metals. 

Answer 1

i. Group of X and Y is IA. 

ii. X belongs to 3^rd period and Y belongs to 5^th period. 

iii. Valence electrons of X and Y is 1. 

iv. Valency of X and Y is 1. 

v. X and Y are alkali metals.