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Q.

An atom has 18 electrons  and 20 neutrons. It has charge of -1 unit. What is its mass number?

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a

35

b

37

c

39

d

38

answer is C.

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Detailed Solution

Charge on the given atom is -1, this means that it has one additional electrons. Hence, number of protons in atom is 17 (18-1) and its atomic mass is 37 (20+17).

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