Question

Which of the following atoms has least atomic size and the highest atomic size respectively
Boron
Carbon
Nitrogen
AIuminium
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[A] Boron and Nitrogen
[B] Nitrogen and Boron
[C] Nitrogen and Aluminium
[D] Aluminium and Nitrogen​

Answer 1

Answer:

Boron and Nitrogen (A)

Answer 2

Answer:

Explanation:

atomic size inversely proportional to  zeff

zeff=z-s

where z is a atomic no and s is inner electrons

z eff of b = 5-2 =3

z eff of c = 6-2=4

z eff of n = 7-2 =5

z eff of al = 13-10=3

there is a tie between b and al

so see no. of inner electrons

no. of inner electrons inversely proportional to z eff and directly proportional to size

aluminium > boron

n has less size because of more z eff

so

answer for your question is

nitrogen and aluminium