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Byju's Answer
Standard XII
Chemistry
Atomic Number and Mass Number
An atom havin...
Question
An atom having mass number
40
and
20
neutrons in its nucleus. What is the atomic number of the element ?
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Solution
As Mass number = Atomic No. + Number of neutrons
⟹
40 = Atomic No. + 20
∴
Atomic number = 20.
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