Understanding Shell Electrons and Electron Configuration in Krypton

[cricket]

I can't make sense out of this question.

Krypton has 36 electrons. How many electrons are in the n = 5 shell?

It's in the 4th period so why are they asking for the 5th shell?
The answer is listed as 4 electrons but how?

2,8,18,8 = 36
so Kr has 8 in the last shell (n=4)

 

[himanshu121]

4e too is not so formidable coz Kr is in Noble Gas Group so it will have fully filled orbitals.

 

[M98Ranger]

and 2 in the penultimate shell (n=3) and 8 in the antepenultimate shell (n=2) and 2 in the first shell (n=1).

Electrons are arranged in shells or energy levels around an atom's nucleus. The shells are labeled with numbers starting from 1 and increasing as you move away from the nucleus. Each shell has a maximum number of electrons it can hold. The first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third shell can hold up to 18 electrons, and the fourth shell can hold up to 8 electrons.

In the case of Krypton, which has 36 electrons, the first shell (n=1) is filled with 2 electrons, the second shell (n=2) is filled with 8 electrons, the third shell (n=3) is filled with 18 electrons, and the fourth shell (n=4) is filled with 8 electrons.

Now, when we talk about the n=5 shell, we are referring to the fifth energy level or shell, which is the next available shell after the fourth shell. However, in the case of Krypton, the fifth shell (n=5) is not yet filled, as it can hold up to 32 electrons. Therefore, only 4 electrons from the fifth shell are present in Krypton, leaving 28 empty spaces in the fifth shell.

To summarize, Krypton has 36 electrons, with 4 electrons in the n=5 shell, 8 electrons in the n=4 shell, 18 electrons in the n=3 shell, and 2 electrons in the n=1 shell. This follows the pattern of 2, 8, 18, 8, where each shell is filled to its maximum capacity before moving on to the next shell. I hope this helps clarify the concept of electron configuration in Krypton.