It an atom that is extremely unreactive. The most inert atoms are the noble gases: helium (He), neon (Ne), argon (Ar), krypton (Kr) and xenon (Xe). Their valence electron shells are complete (the so-called octet rule is satisfied).
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Bonding help atoms in achieving inert gas configuration. It enhances the stabiliy.
Helium has two natural isotopes and is an inert noble gas.
An inert atom or molecule does not react at all with other molecules/atoms. The only inert atoms are the noble gases, group 18 in most periodic tables. Calcium is certainly not inert; in fact, it is the third most reactive element according to the reactivity series of metals.
Inert elements, such as noble gases, exist as monoatoms in molecules because they have a full outer electron shell, making them stable and unlikely to form bonds with other atoms. Their electron configuration is already complete, so they do not need to share electrons with other atoms to achieve stability.
tightly packed atoms