Question

Write the expected electron configuration for the following atoms.$\mathit{S}\mathit{c}\mathbf{,}\mathbf{}\mathit{F}\mathit{e}\mathbf{,}\mathbf{}\mathit{P}\mathbf{,}\mathbf{}\mathit{C}\mathit{s}\mathbf{,}\mathbf{}\mathit{E}\mathit{u}\mathbf{,}\mathbf{}\mathit{P}\mathit{t}\mathbf{,}\mathbf{}\mathit{X}\mathit{e}\mathbf{,}\mathbf{}\mathbf{\&}\mathbf{}\mathit{B}\mathit{r}\mathbf{?}$

Short answer

The knowledge about the distribution of electrons in various energy shells sub-shell and orbital in an atom in the ground state is known as electronic configuration.

Step-by-step solution

Step 1:

The knowledge about the distribution of electrons in various energy shells sub-shell and orbital in an atom in the ground state is known as electronic configuration.

Step 2:

$\mathrm{Sc}\left(21\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^1,4{\mathrm{s}}^2$

$\mathrm{Fe}\left(26\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^1,4{\mathrm{s}}^2$

$\mathrm{p}\left(15\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^3$

$\mathrm{Cs}\left(55\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^{6^{}},3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^{10},4{\mathrm{s}}^2,4{\mathrm{p}}^6,4{\mathrm{d}}^{10},4{\mathrm{f}}^0,5{\mathrm{s}}^2,5{\mathrm{p}}^6,6{\mathrm{s}}^1$

$\mathrm{Eu}\left(63\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^{10},4{\mathrm{s}}^2,4{\mathrm{p}}^6,4{\mathrm{d}}^{10},4{\mathrm{f}}^7,5{\mathrm{s}}^2,5{\mathrm{p}}^6,6{\mathrm{s}}^2$

$\mathrm{Pt}\left(78\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^{10},4{\mathrm{s}}^2,4{\mathrm{p}}^6,4{\mathrm{d}}^{10},5{\mathrm{s}}^2,5{\mathrm{p}}^6,5{\mathrm{d}}^9,6{\mathrm{s}}^1$

$\mathrm{Xe}\left(54\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^{10},4{\mathrm{s}}^2,4{\mathrm{p}}^6,4{\mathrm{d}}^{10},5{\mathrm{s}}^2,5{\mathrm{p}}^6$

$\mathrm{Br}\left(35\right)=1{\mathrm{s}}^2,2{\mathrm{s}}^2,2{\mathrm{p}}^6,3{\mathrm{s}}^2,3{\mathrm{p}}^2,3{\mathrm{p}}^6,3{\mathrm{d}}^{10},4{\mathrm{s}}^2,4{\mathrm{p}}^5$