Answer:

Lithium :

Electron configuration : 2,1

Valence shell : Lithium has 3 electrons --- 2 in the first shell, and 1 in the second shell

number of valence electron : 1

Calcium :

Electron configuration : 2,8,8,2

Valence shell : Two are in the first shell, eight in the second shell, eight in the third shell, and two in the fourth shell.

number of valence electron : 2

Chlorine :

Electron configuration : 2,8,7

Valence shell : The last shell of a chlorine atom has 7 electrons in it. Therefore, there are 7 valence electrons in an chlorine atom.

number of valence electron : 7

Oxygen :

Electron configuration : 2,6

Valence shell : two in the first shell and four in the second shell .

number of valence electron : 6

Explanation:

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To do:

The electronic configuration of the following element also mention the name of valence shell and number of valence electron for the same.

Solution:

Lithium :

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Calcium:

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Chlorine :

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Oxygen:

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