Question

The electronic configuration of lithium atom is .

• A. 2,1
• B. 1,2
• C. 2,4
• D. 2,3

Answer 1

The correct option is A 2,1

Atomic number of an atom is equal to the number of protons in an atom. For a neutral atom, the number of protons is equal to the number electrons.

The innermost shell of an atom can accommodate a maximum of two electrons and the second shell can accommodate a maximum of eight electrons.

Atomic number of lithium (Li) is 3. Hence, lithium has 3 electrons and its electronic configuration is 2,1.