An element has 20 electrons and mass number 40. Write:
(a)the number of neutrons and (b) its atomic number
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An element has 20 electrons and mass number 40. Write:
(a)the number of neutrons and (b) its atomic number
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Answer:
The element has 20 electrons.
(a) We know that, mass number = n + p.
Also, p = e.
Hence, p = mass number - e
So, Protons = 40 - 20 = 20.
(b) Atomic number = electrons
Hence, Atomic number = 20.
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