Chemistry
Write down :
(i) the mass number of the atom having 20 neutrons and 15 protons.
(ii) the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.
Atomic Structure
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Answer
(i) Mass number (A) = Neutrons (n) + Protons (p) = 20 + 15 = 35
(ii) Number of neutrons = n = A -Z = 37 – 17 = 20
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