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How many electrons are in each shell in SPDF?

Published in Electron Configuration 1 min read

The number of electrons in each subshell (s, p, d, f) is fixed: s holds 2, p holds 6, d holds 10, and f holds 14. These subshells fill in a specific order to determine the electron configuration of an atom.

According to the reference, "The s-subshell can fit 2 electrons, p-subshell can fit a maximum of 6 electrons, d-subshell can fit a maximum of 10 electrons, and f-subshell can fit a maximum of 14 electrons".

Here's a breakdown of the maximum electron capacity for each subshell:

Subshell Maximum Number of Electrons
s 2
p 6
d 10
f 14

The total number of electrons in each shell is the sum of the electrons in its subshells. The first shell (n=1) has only the 1s subshell and can thus only contain 2 electrons. Higher numbered shells will have more subshells.

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