What does the 4 indicate in 1s22s22p4? 4th subshell 4 electrons 4th energy level

The number 4 indicates 4 electrons.

Explanation: We are given an electronic configuration, which is:

Here,

The letters denote the sub-shells of an element.The numbers written before the letters which are 1, 2 and 2 represents the Principle Quantum Number and these represents the energy level of the sub-shells.The number which are written in the superscripts which are 2, 2 and 4 denotes the electrons which are present in the sub-shell.

Hence, 4 indicates 4 electrons present in 2p sub-shell.

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