An element belonging to $3\mathrm{d}$ series of modern periodic table has spin magnetic moment $=5.92 \mathrm{B}. \mathrm{M}$. in $+3$ oxidation state. Determine the atomic number of element.

How many of the following have greater ${\mathrm{Z}}_{\mathrm{eff}}$ than Silicon atom:

(i) $\mathrm{Na}$ (ii) $\mathrm{Mg}$ (iii) $\mathrm{Al}$ (iv) $\mathrm{P}$ (v) $\mathrm{Cl}$ (vi) $\mathrm{S}$ (vii) $\mathrm{N}$ (viii) $\mathrm{O}$ (ix) $\mathrm{F}$

How many of the following compounds are found to exist?

(i) ${\mathrm{BiF}}_5$ (ii) ${\mathrm{TlI}}_3$ (iii) ${\mathrm{PbO}}_2$ (iv) ${\mathrm{SnCl}}_2$ (v) ${\mathrm{Tl}}_2{\mathrm{O}}_3$ (vi) ${\mathrm{PbI}}_4$ (vii) ${\mathrm{As}}_2{\mathrm{O}}_3$

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

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