Stable electron configurations are likely to contain (1 point)
a. filled energy sublevels
b. fewer electrons than unstable configurations
c. unfilled s orbitals
d. electrons with a clockwise spin

Option (A) is the correct answer.

Explanation:

A stable electronic configuration will have completely filled energy sub levels. Completely filled sub levels correspond to noble gases which are less reactive and more stable.

The orbital closer to the nucleus will be filled first and later on the other orbitals will be filled.

Thus, we can conclude that stable electron configurations are likely to contain filled energy sub levels.

A. filled energy sublevels

Explanation:

The stable configurations of electrons are those that have the energy sublevels filled and correspond to the configutation of the noble gases which under normal conditions are unreactive because of their stable configurations. The configurations of noble gases up to Xe is given below , remember the s sublevel can accomodate a maximum of two electrons and the p 6 electrons

He configuration: 1s²

Ne  1s²2s²2p⁶

Ar  (Ne) 3s²3p⁶

Kr  (Ar) 4s²4p⁶

Xe (Kr) 4d¹⁰5s²5p⁶

i just learnt this recently but i need to look through my notes again