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Q.

A bismuth atom has 83 protons. The mass number of bismuth is 209. How many neutrons are present in an atom of bismuth?

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a

83

b

126

c

209

d

292

answer is B.

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Detailed Solution

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Number of neutrons in a bismuth atom is 126.

Solution:

Mass number = Number of protons + Number of neutrons

Number of neutrons = Mass number − Number of protons

                                         = 209 − 83

                                         = 126

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