State the order of filling atomic orbitals following Aufbau principle.

Write orbital notations for electrons in orbitals with the following quantum numbers.

$\mathrm{n}=2,\mathrm{l}=1$

Write orbital notation for electrons in orbitals with the following quantum numbers.

$\mathrm{n}=4,\mathrm{l}=2$

Write orbital notations for electrons in orbitals with the following quantum numbers.

$\mathrm{n}=3,\mathrm{l}=2$

Write condensed orbital notation of electronic configuration of the following element:

Lithium $(\mathrm{Z}=3)$

Write condensed orbital notation of electronic configuration of the following element:

Carbon $(\mathrm{Z}=6)$

Write condensed orbital notation of electronic configuration of the following element:

Oxygen $(\mathrm{Z}=8)$