Question

In magnesium atoms, in ground state, the number of electrons with \[m = 0\] is.
A. $4$
B. $4$
C. $2$
D. $8$

Answer 1

Hint:
We know
-Aufbau’s principle:
Aufbau's rule expresses that electrons are filled into nuclear orbitals inside the expanding request of orbital energy state. Reliable with the Aufbau guideline the accessible nuclear orbitals with absolute bottom energy levels are involved before those with higher energy levels.
-Hund's Rule:
As indicated by Hund's standard each orbital in a subshell is independently busy with one electron before any one orbital is doubly involved and all electrons in separately involved orbitals have a similar turn.

Complete step by step answer:
We have to remember that the Azimuthal Quantum Number portrays the state of the orbital. It is spoken to as 'l'. The estimation of l goes from \[0\]to $\left( {n - 1} \right)$. For \[l = 0,1,2,3\] etc. the orbitals are s, p, d, f.
Magnetic Quantum Number: It portrays the direction of the orbitals. It is spoken to as$m$ . The estimation of this quantum number reaches from $ - l$ to $ + l$. For the estimation of $m = 0$, the estimation of l must be zero, i.e. s orbital.
Electronic setup speaks to the complete number of electrons that an impartial component contains. We add all the superscripts to know the quantity of electrons in a particle.
The electrons are filled by Aufbau’s standard arranged by expanding energies and in this manner the electronic setup for magnesium with a nuclear number of 12. The electronic configuration is $1{s^2}2{s^2}2{p^6}3{s^2}$.
The number of electrons in s orbital \[ = 2 + 2 + 2 = 6\].
So, the correct answer is “Option B”.

Note:
We have to know that the principal energy level of an electron denotes the orbital in which the electron is situated according to the atom’s nucleus.
As we know that the Azimuthal quantum number denotes the subshell (orbital) to which the electron belongs and also determines the shape of the orbital and the energy associated with the angular momentum of the electron.
-The chosen orientations of orbitals in space determined by magnetic quantum number.
-The spin quantum number’ is related to electron spin.