A and B are two salts which are responsible for the hardness of water If the size of Metal - Science - Periodic Classification of Elements

Question

A and B are two salts which are responsible for the hardness of
water If the size of Metal X present in salt A is larger than the
size of Metal Y present in salt B then which of the following
elements does not belong to the same period as that of metal Y in
the modern periodic table 1 Na 2 K 3 Al 4 Cl

Neha Malcom · Answer

Calcium and Magnesium salts are two salts which are responsible for
the hardness of water Since size of Metal X present in salt A is
larger than the size of Metal Y present in salt B, Metal
X must be Calcium and Metal
Y must be Magnesium because as we go from
top to bottom in a group of the periodic table, the size of the
atom increases as the number of shells increases Metal Y i e
Magnesium belongs to the third period; but
Potassium is the only one that belongs to the
fourth period and not the third period Therefore, K does not
belong to the same period as that of Metal Y in the Modern Periodic
Table