Question

Atomic size: The term atomic size refers to the radius of an atom. The
atomic size may be visualised as the distance between the centre of the
nucleus and the outermost shell of an isolated atom.

What is an isolated atom ?
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Answer 1

Answer:

Isolated atom basically means atom which exists separatly without any bonding with other atoms. It can only be acheived experimentaly because normally all atoms are bonded together by strong nuclear forces and its really hard to isolate a single atom.