Question

The number of unpaired electrons in 1s2 2s2 2p4

Answer 1

Please refer to the attachment

The number of unpaired electrons in this case is 2.......

Hope u get that.....

Answer 2

The number of unpaired electrons in $1s^22s^22p^4$ are 2

Explanation:

According to Hund's rule , when electrons are filled in orbitals of equal energy, one electron enters each orbital until all the orbitals contain one electron with the same spin direction.  then the pairing of electrons take place.

Thus in electronic configuration $1s^22s^22p^4$  , the electrons in p subshell are filled in 3 orbitals such that every orbital contains one electron each. The fourth electron will be paired up with the first electron and the other two electrons remain unpaired .

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