An element attains the stable configurations, when _______ electrons are there in the valence shell.

The correct answer is: 8

• Atoms have different shells of electrons, each shell contains a set number of maximum electrons.
• The electronic configuration is done in accordance with the octet rule which states a max number of 8 electrons can be in one shell after the first shell.
• Atoms are most stable when their outer valence shell is full with eight electrons.