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What is the number of valence electrons ...

What is the number of valence electrons in the atom of an element A having atomic number 20? Name the valence shell of this atom.

Text Solution

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The electronic configuration of element A is
`{:(K,L,M,N),(2,8,8,2):}`
Therefore, the N shell is the outermost shell or the valence shell. Number of valence electrons
= number of electrons in the outermost shell =2
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