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Question

The atomic number of an atom is 19 and its mass number is 39. Which of the following are correct?


A

Number of electrons = 20

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B

Number of neutrons = 19

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C

Number of neutrons = 20

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D

Number of protons = 19

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Solution

The correct options are
C

Number of neutrons = 20


D

Number of protons = 19


The atomic number gives the number of protons present in an atom. For a neutral atom, it also represents the number of electrons.
Hence, number of protons = 19

Mass number is the sum of the number of protons and neutrons present in the nucleus of an atom.
Hence, no. of neutrons = mass number - number of protons =3919=20.


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