Question

Define the following terms-
1) Valency
2)Molecule
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Answer 1

Answer:

(i) Valency: The combining power or the combining capacity of an atom is called its valency. ...

(ii) Atomic size: Atomic size or atomic radius is the distance between the centre of the nucleus and the outermost shell of an isolated atom

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Answer 2

the number of electrons that an atom may lose or gain during a chemical reaction or the number of electrons shared.

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Molecule is the smallest unit (particle) of a compound having the physical and chemical properties of that compound.