Question

Write down the electronic configuration of the first three elements of group 1 of modern periodic table

Answer 1

Explanation:

the the electronic configuration of first three element of group 1 of modern periodic table are:-

1.element hydrogen

atomic number = 1

symbol of element = H

electronic configuration:- K shell

1

valence electrons = 1

valence electron = 1

.......................

2. element helium

atomic number: 2

symbol of element: He

electronic configuration: 2

valence electron: 2

valency of electron: 0

...................

3. element lithium

atomic number: 3

symbol of element: li

electronic configuration: 2,1

valence electron: 1

valency: 1

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