An atom has a mass number 35 and the atomic number 17. The number of neutrons in its nucleus are ________.

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Solution

For any element, Mass number = Number of nucleons
Nucleons = Number of protons + Number of neutrons
Therefore, Mass number = Number of protons + Number of neutrons
Number of neutrons = Mass number - Number of protons …….. (i)
For an electrically neutral species like atom of any element, Atomic number = Number of protons
Atomic number = 17 (Given)
Therefore, Number of protons= 17
Mass number = 35 (Given)
By substituting the values in (i)
Number of neutrons = 35- 17= 18
Therefore, an atom has a mass number 35 and the atomic number 17. The number of neutrons in its nucleus are 18.

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