Identify the element that has the larger atomic radius in each pair of the following and mark it with a symbol (3).

(i) Mg or Ca

(ii) Li or Cs

(iii) N or P

(iv) B or Al

Note: Atomic radius goes on decreasing as we move from left to right.

Atomic radius goes on increasing from top to bottom.

i) Ca has larger atomic radius because as we move from Mg to Ca, the atomic radius increases.

ii) Cs has larger atomic radius because as we move from Li to Cs, the atomic radius increases.

iii) P has larger atomic radius because as we move from N to P, the atomic radius increases.

iv) Al has larger atomic radius because as we move from B to Al, the atomic radius increases.