c. Monoatomic molecule
d. Diatomic molecule
- Valency: Valency is the number of hydrogen atoms which can combine with one atom of the element forming a compound.
- Symbol: A symbol is a short form or abbreviated name of the element.
- Monoatomic molecule: A molecule is monoatomic when it contains only one atom.
- Diatomic molecule: A molecule is diatomic when it contains two atoms.
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