Question

Which of the following best describes atoms? *

Answer 1

a. Smallest basic units of matter

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Atom: An atom is the smallest particles of a substance which may or may not exist in free state but takes part in chemical reactions.

Molecule: A molecule is a substance which exists in free state but doesn't take part in chemical reactions.

Laws of chemical combination:-

• Law of conservation of mass

• Law of constant proportions

• Law of multiple proportions

• Law of combining volumes

• Law of reciprocal proportions