Question

how is the size of an atom indicated?

Answer 1

Hello!
The Size of an Atom is indicated by the Number of Shells It has.
Suppose an Atom "X"has Two Shells and an Atom "Y" Has 5 Shells. So, The size of Atom Y is More Than X. It's Because the Distance Between the Nucleus and The Outermost Shell increases.

The Size of an Atom is Normally Measured in Nanometers . It's So Tiny That It Can't Be Visualised From Our Naked Eyes . For Eg:- The Size of Hydrogen atom is
${10}^{9} m$
$note \: \: 1m= {10}^{ - 9} nm$
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