Choose the species with the highest electron affinity:

How many of the following radius orders are incorrect?

(a) ${\mathrm{N}}^{3-}>{\mathrm{P}}^{3-}$
(b) ${\mathrm{O}}^{2-}>{\mathrm{F}}^{-}$
(c) ${\mathrm{Ca}}^{2+}>{\mathrm{Sr}}^{2+}$
(d) ${\mathrm{S}}^{-}>{\mathrm{S}}^{2-}$
(e) ${\mathrm{S}}^{2-}>{\mathrm{O}}^{-}$

Report atomic number of the element having the largest size among the following:

$\mathrm{Ni}, \mathrm{Cu}, \mathrm{Zn}$

Atomic mass of $\mathrm{Cl}=35.5\mathrm{u}$ and that of $\mathrm{I}=127\mathrm{u}$. According to Dobereiner's triad rule, atomic mass of $\mathrm{Br}$ will be________$\mathrm{u}.$

Round off your answer to the nearest integer.

How many of the following are inner transition elements?

$\mathrm{Zr}, \mathrm{U}, \mathrm{Eu}, \mathrm{Au}, \mathrm{Co}, \mathrm{Os}, \mathrm{Ce}, \mathrm{Gd}, \mathrm{Hf}$