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Atomicity

Which of the ...

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Which of the following statements are true?
(i) An element consists of only one type of particles.
(ii) $H_{2} O$ is a compound.
(iii) Two or more elements chemically combined in a fixed proportion to form a compound.
(iv) NaCl is an element.

A) i, ii, and iii
B) i and iii
C) ii and iv

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Q. Question 8
Two substances, A and B were made to react to form a third substance,

A_{2} B

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2 A + B \to A_{2} B

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