${\mathrm{Na}}_2{\mathrm{CO}}_3$ can be manufactured by Solvay's process but ${\mathrm{K}}_2{\mathrm{CO}}_3$ CANNOT be prepared because _________.

Washing soda is _________.

Molten sodium is used in nuclear reactors to:

Excess of ${\mathrm{Na}}^{+}$ ions in our system causes:

Which of the following can be represented by the configuration$\left[\mathrm{Kr}\right]5{\mathrm{s}}^2$?