Filling of Electrons in Orbitals and Electronic Configuration of Elements

An ion has $18$ electrons in the outermost shell is:

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

"Number of electrons in an atom can have the same set of four quantam numbers" is known as:

why in electronic configuration we do not get $6\mathrm{f}$ subshell?

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.

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

If $\mathrm{n}=3$, the maximum number of electron possible in this shell is _____. (Write number)

For a multi-electron atom, the highest energy level among the following is

Which of the following shell have maximum $32$ electrons?

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.