Question

The electron configuration 1s2 2s22p6 3s23p6 represents which noble gas? neon argon helium krypton

Answer 1

Answer: Argon

Explanation:-

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration

$1s^22s^22p^63s^23p^6$

Total number of electrons = 2+2+6+2+6 = 18

The element which has 18 electrons in its ground state is argon.

Neon has 10 electrons.

Helium has 2 electrons.

Krypton has 36 electrons.

Answer 2

It's is Argon !.....answer!