【】How many valence electrons are there in 1s2 2s2 2p6 3s2 3p6 4s2

How many valence electrons are there in 1s2 2s2 2p6 3s2 3p6 4s2?



Answer:
The element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 has two valence electrons.But it has totally 20 electrons.

Explanation:

Given, 1s2 2s2 2p6 3s2 3p6 4s2

At first,find out the Valence shell.Here, the fourth shell is the valence shell 4s2.We know that the electrons in valence shell are called valence electrons.Here we get two valence electrons in 4s2.That is why the element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 has two valence electrons.

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