Mention the period to which Na,Mg and Al belong to. Justify their positions in the periodic table.

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Solution

Sodium, Na
atomic number = 11
Electronic configuration = 1s² 2s² 2p⁶ 3s¹
Since last electron goes to 3s-orbital hence it belongs to 3^rd period.

Magnesium, Mg
atomic number = 12
Electronic configuration = 1s² 2s² 2p⁶ 3s²
Since last electron goes to 3s-orbital hence it belongs to 3^rd period.

Aluminium, Al
atomic number = 13
Electronic configuration = 1s² 2s² 2p⁶ 3s²3p¹
Since last electron goes to 3p-orbital hence it belongs to 3^rd period.

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Similar questions

Consider the following elements :

Na, Ca, Al, K, Mg, Li

(a) Which of these elements belong to the same period of the periodic table?

(b) Which of these elements belong to the same group of the periodic table?

A l

N a, M g, A l

S i

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