Question

For H-atom which pair of sub-shell has same energy

A) 1s, 2s
B) 2s, 2p
C) 3p, 4d
D) 4p, 6d

Please answer the correct answer quickly​

Answer 1

Answer:

Correct option is

C

3d, 4p

D

5p, 4d

According to this,

n+l rule,

3d and 4p have same energy as

3+2 =5 4+1 =5

similarly 4d and 5p have same energy.

Explanation:

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Answer 2

None of the given pairs have the same energy.

• The energy of a sub-shell can be determined using the formula n+l, where n is the principal quantum number and l is the azimuthal quantum number.
• The value of n is the value of the shell number whereas, the value of l is 0 for s-orbital, 1 for p-orbital, 2 for d-orbital, and 3 for d-orbital.
• Hence energy of a subshell is formulated as n + l.

Option A:

• 1s has n, l values  1, 0 respectively, the n+l value is 1.
• 2s has n, l values 2, 0 respectively, the n+l value is 2.
• Hence, they do not have the same energy.

Option B:

• 2s has n, l values  2, 0 respectively, the n+l value is 2.
• 2p has n, l values 2, 1 respectively, the n+l value is 3.

• Hence, they do not have the same energy.

Option C:

• 3p has n, l values  3, 1 respectively, the n+l value is 4.
• 4d has n, l values 4, 2 respectively, the n+l value is 6.

• Hence, they do not have the same energy.

Option D:

• 4p has n, l values  4, 1 respectively, the n+l value is 5.
• 6d has n, l values 6, 2 respectively, the n+l value is 8.

• Hence, they do not have the same energy.

Therefore, Of the given pairs none of the pairs has the same energies.