Filling of Electrons in Orbitals

Number of unpaired electrons in ${\mathrm{N}}^{2+}$ is

For which one of the following sets of four quantum numbers, an electron will have the highest energy?

Assertion : The ${19}^{\mathrm{th} }$electron in potassium atom enters into $4\mathrm{s}-$orbital and not the $3\mathrm{d}-$orbital.

Reason : $(\mathrm{n} + \mathrm{l})$ rule is followed for determining the orbital of the lowest energy state.

Explain the Aufbau principle with copper and chromium.

Pauli exclusion principle states that the ground state of the atoms, the orbitals are filled in order of their increasing energies.

According to the Aufbau principle, valence electron in _____ must choose between 3d and 4s orbitals and as predicted by this sequence, it is found in 4s orbital.

Which formula is used for calculating effective nuclear charge?

What effective nuclear charge?

What do you mean by effective nuclear charge?

The total number of electrons present in all the $\mathrm{p}-$orbitals in the ground state of ${}_{34}\mathrm{Se}$ are

What is the total number of unpaired electrons in one mole of ${}_{29}\mathrm{Cu}$?

Maximum number of electrons in a subshell of an atom is determined by $4\mathrm{l}+2$.

Which rule of filling of electrons states that every orbital in a sublevel is singly occupied before any orbital is doubly occupied, all the electrons in singly occupied orbitals have the same spin?

Among $3\mathrm{d}$ and $4\mathrm{s}$, which orbital have higher energy

Electronic configuration of ${\mathrm{Na}}^{+}$ and ${\mathrm{Cl}}^{-}$ are:

The maximum number of electrons that an orbit ($\mathrm{n}$) can have _____.

(A) $2{\mathrm{n}}^2$

(B) $2\mathrm{n}$

(C) $2{\mathrm{n}}^4$

Enter the correct answer as A, B or C.

The correct set of four quantum numbers for the valence electron of rubidium atom $(\mathrm{Z} = 37)$ is:

Why does chromium $\left(\mathrm{Cr}\right)$ ) have exceptional electronic configuration? 

Half filled orbitals are more stable due to the exchange energy and symmetrical distribution of electrons