Explain why- $\mathrm{Cu}$ forms coloured salts while $\mathrm{Zn}$ forms colourless salts?

Write the outer electronic configuration of the following using orbital notations method. Justify.

$\mathrm{Ge}$ (belongs to period $4$ and group $14$)

Write the outer electronic configuration of the following using orbital notations method. Justify.

$\mathrm{Po}$ (belongs to period $6$ and group $16$  )

Write the outer electronic configuration of the following using orbital notations method. Justify.

$\mathrm{Cu}$ (belongs to period $4$ and group $11$)

Answer the following:

$\mathrm{La}$ belongs to group $3$ while $\mathrm{Hg}$ belongs to group $12$ and both belong to period $6$ of the periodic table. Write down the general outer electronic configuration of the ten elements from $\mathrm{La}$ to $\mathrm{Hg}$ together using orbital notation method.

Answer the following:

Ionisation enthalpy of $\mathrm{Li}$ is $520 \mathrm{kJ} {\mathrm{mol}}^{-1}$ while that of $\mathrm{F}$ is $1680 \mathrm{kJ} {\mathrm{mol}}^{-1}$. Explain.

Explain why the second ionization enthalpy is greater than the first ionization enthalpy?