O2 is a diatomic molecule.
Element containing more than 3 atoms.
Positive charged particle inside the nucleus.
No. of electrons = No. of protons
All these elements contain one atom.
Diatomic molecule is one which contains two atoms.
Recall the definition of the terms given in the option.
Monoatomic atom is one whose atomicity is one.
Polyatomic element is one which contains more than 3 atoms.
Argon is a non reactive noble gas.
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