Question

state how do atom exists?formula unit mass.atomic mass unit gram atomic mass unit?

Answer 1

An atom is the smallest particle of an elemen that can exist independently and retain all its chemical properties.

Answer 2

=>Atoms are the smallest particle of an element that can exist independently .
=>Atoms exists in the form of :-
1. molecules
Example : N₂ , H₂ , etc..

2. ions
Example - Fe²⁺ , S²⁻ , etc...

3. Atoms
Example - He , Li , etc ...
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Formula Unit mass is the sum of all the atomic masses of the atoms in a formula unit of a substance.
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One atomic mass unit is a mass unit equal to exactly 1/12th the mass of 1 atom of Carbon - 12.
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The relative atomic mass of a element expressed in gram is known as gram atomic mass.