Question

Assertion
Angular momentum of 1S, 2S, 3S, etc., all have a spherical shape.
Reason
1s, 2s, 3s, etc., all have a spherical shape.
A.Both assertion and reason are correct and the reason is the correct explanation for assertion
B.Both assertion and reason are correct, but the reason is not the correct explanation for assertion
C.The assertion is correct but the reason is incorrect
D.Both assertion and reason are incorrect.

Answer 1

Angular momentum of an electron can be calculated using different formulas given by several scientists. The second quantum number that is the azimuthal quantum number is also used to find the angular momentum of an electron.

Complete step by step answer:
The angular momentum of an electron in the quantum number is given by the second quantum number, azimuthal quantum numbers. It is denoted by ‘l’, and it states the subshell and the magnitude of orbital angular momentum.
Now, there are five different subshells of an atom, s, p, d, and f, let us discuss them below thoroughly;
The first subshell of an atom is the$s$subshell, it is nearest to the nucleus of an atom. It is spherical in shape and can accommodate two electrons because it has only one orbital(each orbital can accommodate two electrons).
The second subshell is $p$ subshell, it is next to the $s$ subshell. It is dumbbell in shape and can accommodate six electrons because it has three orbitals that are ${p_x}$, ${p_y}$, ${p_z}$.
The third subshell is $d$ subshell, it is next to the $p$subshell. It is clover in shape and can accommodate ten electrons, because it has five orbitals that is ${d_{xy}}$, ${d_{yz}}$ ,${d_{xz}}$, ${d_{{x^2} - {y^2}}}$, ${d_{{z^2}}}$
The fourth subshell is $f$ subshell, it is next to the $d$ subshell. It is tetrahedral in shape and can accommodate fourteen electrons because it has five orbitals that are this subshell is a bit complicated.
Now according to azimuthal quantum number $l = n - 1$;
Where $n$is accordance to the subshell that is;
$s \Rightarrow n = 0$
$p \Rightarrow n = 1$
$d \Rightarrow n = 2$
$f \Rightarrow n = 3$
Hence, both assertion and reason are correct and reason are the best explanation for the assertion.
So option A is the correct answer.

Note:
The periodic table is in the accordance with the subshell that is, the two metal groups on the right-hand side have their valence electron in $s$ subshell, therefore, they are called $s$ block elements, and similarly the $p$ block $d$ block and $f$ block elements are situated.