Question

The electron configurations of two unknown elements are x and y. X: 1s2 2s2 2p6 Y: 1s2 2s2 2p6 3s2 3p5 which statement is most likely correct about the two elements

Answer 1

X: 2,8 = Neon

Y: 2,8,7= Chlorine

Neon has an atomic number of 10. It is referred to as a noble gas and it’s a mono atomic element.

Chlorine has an atomic number of 17. It is referred to as an Halogen. Chlorine exists in nature as a diatomic molecule.

However the question is incomplete and will need more information.