Two elements are X with atomic number 11 ---- Sodium
Y has less metallic character because metallic character decreases in a period from left to right.
2. .Calculate the valency of each element.
Element X --- electronic configuration : 1s22s22p63s1
so valency is one.
Element Y electronic configuration : 1s22s22p63s23p3
Velency is three.
3 "Element ‘X’ is bigger than ‘Y’ in terms of atomic size. Is the statement true, justify? "
Its true . Because atomic size decreases over period due to increase in nuclear Charge.
-Answered by Himanshi Verma On 22 March 2019:05:03:50 PM