Atomic Structure Questions | Chemistry JEE Main Important Questions

Q 1 :
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is: [2024]

5, 1, 0, + $\frac{1}{2}$
5, 1, 1, + $\frac{1}{2}$
5, 0, 1, + $\frac{1}{2}$
5, 0, 0, + $\frac{1}{2}$

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(D) ${}_{37}R b = {}_{36}[K r] 5 s^{1}$

For last electron, $n = 5, l = 0, m = 0, s = \frac{+ 1}{2} or \frac{- 1}{2}$

Q 2 :
Given below are two statements:

Statement (I): The orbitals having same energy are called as degenerate orbitals.

Statement (II): In hydrogen atom, 3p and 3d orbitals are not degenerate orbitals.

In the light of the above statements, choose the most appropriate answer from the options given below: [2024]

Statement I is true but Statement II is false
Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is false but Statement II is true

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(A) Different subshells of a particular shell have different energies in the case of multi- electrons atoms. AIl the orbitals within the same subshell have the same energy, these are called degenerate orbitals. In a multielectron system energy of an orbital depends upon its ( $n + l$ ) value. The higher the value of ( $n + l$ ), more is the energy of the orbital.

However, in a hydrogen atom, all the subshells in a shell have the same energy i.e. value of energy depends only upon value of n and not upon ( $n + l$ ). 3p and 3d orbitals in hydrogen atoms have same energy (degenerate).

Q 3 :
The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are [2024]

$n = 4, l = 0, m = 0, s = + \frac{1}{2}$
$n = 2, l = 0, m = 0, s = + \frac{1}{2}$
$n = 4, l = 2, m = - 1, s = + \frac{1}{2}$
$n = 3, l = 0, m = 1, s = + \frac{1}{2}$

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(A) ${}_{19}K = {}_{18}[A r] 4$ $s^{1}$

The four quantum numbers of outermost orbital electron are:

$n = 4, l = 0 (s subshell), m = 0 (s orbital), s = + \frac{1}{2} or - \frac{1}{2}$

Q 4 :
Compare the energies of following sets of quantum numbers for multielectron system.

$(A) n = 4, l = 1$

$(B) n = 4, l = 2$

$(C) n = 3, l = 1$

$(D) n = 3, l = 2$

$(E) n = 4, l = 0$

Choose the correct answer from the options given below: [2024]

(C) < (E) < (D) < (A) < (B)
(E) < (C) < (D) < (A) < (B)
(B) > (A) > (C) > (E) > (D)
(E) > (C) > (A) > (D) > (B)

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(A) For multielectron species, more is value of $n + 1$ for an orbital, more is the energy of the orbital. If two orbitals have same value of $n + 1$ , then the one with higher value of $n$ has higher energy.

Q 5 :

In an atom, total number of electrons having quantum numbers $n = 4,$ $| m_{1} | = 1$ and $m_{s} = - \frac{1}{2}$ is _________ . [2024]

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(6)

Principal quantum number (n)	Azimuthal quantum number (l)	Magnetic quantum number (m)
4	0	0
	1	-1, 0, +1
	2	-2, -1, 0, +1, +2
	3	-3, -2, -1, 0, +1, +2, +3

There are total 6 orbitals with $| m | = 1$ (three with $m = - 1$ and other three with $m = + 1$ ). Each of these six orbitals can have an electron with $m_{s} = \frac{- 1}{2}$

Topic Question Set

Q 1 :
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is: [2024]

Q 3 :
The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are [2024]

Q 4 :
Compare the energies of following sets of quantum numbers for multielectron system.

$(A) n = 4, l = 1$

$(B) n = 4, l = 2$

$(C) n = 3, l = 1$

$(D) n = 3, l = 2$

$(E) n = 4, l = 0$

Choose the correct answer from the options given below: [2024]

Q 5 :

In an atom, total number of electrons having quantum numbers $n = 4,$ $| m_{1} | = 1$ and $m_{s} = - \frac{1}{2}$ is _________ . [2024]

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Topic Question Set

Q 1 : The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is: [2024]

Q 3 : The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are [2024]

Q 4 : Compare the energies of following sets of quantum numbers for multielectron system. (A) n=4,l=1 (B) n=4,l=2 (C) n=3,l=1 (D) n=3,l=2 (E) n=4,l=0 Choose the correct answer from the options given below: [2024]

Q 5 : In an atom, total number of electrons having quantum numbers n=4, |m1|=1 and ms=-12 is _________ . [2024]

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Q 1 :
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is: [2024]

Q 3 :
The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are [2024]

Q 4 :
Compare the energies of following sets of quantum numbers for multielectron system.

$(A) n = 4, l = 1$

$(B) n = 4, l = 2$

$(C) n = 3, l = 1$

$(D) n = 3, l = 2$

$(E) n = 4, l = 0$

Choose the correct answer from the options given below: [2024]

Q 5 :

In an atom, total number of electrons having quantum numbers $n = 4,$ $| m_{1} | = 1$ and $m_{s} = - \frac{1}{2}$ is _________ . [2024]