Answer the following.

Out of $\mathrm{NaOH}$ or $\mathrm{Mg}(\mathrm{OH}{)}_2$, which is a stronger base?

Answer the following

Which element in the group 2 is radioactive?

Answer the following.

Which out of ${\mathrm{Mg}}^{2+}$, ${\mathrm{Ba}}^{2+}$,${\mathrm{Ca}}^{2+}$ has maximum ionic mobility in water?