Qstnid -A-8- A Certain Nucleus Has A Mass Number 20 And Atomic Number 9. Find The Number Of Neutrons And Protons Present In It. - 12: Radioactivity - Icse-x-physics

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ICSE-X-Physics

12: Radioactivity

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#8
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
Ans : 8 (i) Number of neutrons = Mass number - Atomic number
= 20 - 9 = 11
(ii) Number of protons = Atomic number = 9.