Question

(1) What is the valence electron configuration for the sodium atom?

(2) What is the valence electron configuration for the argon atom?

Answer 1

Sodium atom has Atomic number = 11

The electronic configuration = 1s² 2s² 2p⁶ 3s¹

In this electrons in 1st and 2nd shells are called Core electrons and electrons in 3rd shell are called Valence electrons

So the valence electronic configuration of Sodium = 3s¹

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Sodium atom has Atomic number = 18

The electronic configuration = 1s² 2s² 2p⁶ 3s²3p⁶

In this, electrons in 1st and 2nd shells are called Core electrons and electrons in 3rd shell are called Valence electrons

So the valence electronic configuration of Argon = 3s²3p⁶