Which among the following shows that an atom is stable?

Answer 1

An atom is considered stable when its outer electron shell is full or follows the octet rule, meaning it has eight electrons in its valence shell (or two for very light elements like helium). This stability is often achieved through chemical bonding with other atoms, either by sharing or transferring electrons. Additionally, a stable atom typically has a balanced number of protons and neutrons, contributing to its overall nuclear stability.