MCQ
Of the following, the one with largest size is
- ✓$C{l^ - }$
- B$Ar$
- C${K^ + }$
- D$C{a^{2 + }}$
$Cl ^{-}-1 s ^2 2 s ^2 2 p ^6 3 s ^2 3 p ^6$
It has 18 electrons and $17$ protons
Ar $-1 s^2 2 s^2 2 p^6 3 s^2 3 p^6$
It has 18 electrons and $18$ protons
$K ^{+}-1 s ^2 2 s ^2 2 p ^6 3 s ^2 3 p ^6$
It has 18 electrons and 19 protons
$Ca ^{2+}-1 s ^2 2 s ^2 2 p ^6 3 s ^2 3 p^6$
It has 18 electrons and $20$ protons
From this information, we can easily conclude that $Cl ^{-}$would be the largest because it has a higher number of electrons as compared to protons and so the 'effective nuclear charge' would be lower on each electron.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| $(n)$-$(l)$-$(m)$-$(s)$ | |
| $(i)$ | $(3)$-$(2)$-$(1)$- $(+1/2)$ |
| $(ii)$ | $(2)$-$(2)$-$(1)$- $(+1/2)$ |
| $(iii)$ | $(4)$-$(3)$-$(-2)$- $(-1/2)$ |
| $(iv)$ | $(1)$-$(0)$-$(-1)$- $(-1/2)$ |
| $(v)$ | $(3)$-$(2$-$(3)$- $(+1/2)$ |
Which of the following sets of quantum number is not possible ?