Question

Which is correct statement?


Eighteen electrons can have n + l = 5, in atom



In hydrogen energy of 2p orbital is greater than 2s



In helium 2s and 2p orbitals have same energy



3d orbital lies closer to nucleus as compared to 3s

Answer 1

Explanation:

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In helium 2s and 2p orbitals have same energy

Answer 2

Answer:

Out of all the given statements, the correct statement is identified to be the following:

"18 electrons can have n+l=5, in atom."

Explanation:

The given equation, n + l = 5 can have many possibilities in terms of orbitals. The possible combinations are given below:

• n = 5 , l = 0 : orbital 5s [ Number of electrons are going to be 2]
• n = 4 , l = 1 : orbital 4p [ Number of electrons are going to be 6]
• n = 3 , l = 2 : orbital 3d [ Number of electrons are going to be 10]
• n = 2 , l = 3 and more n < 2: orbitals impossible (because l value should always be n - 1 and cannot be greater than n)

The only three sub-shells/orbitals which are satisfying the required given equation, n+l=5 are 5s, 4p, 3d.

So, total electrons possible are: 2 + 6 + 10 = 18

Hence the number of electrons present that can be present are found to be 18 (eighteen).

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