Question

How many neutrons and protons arc there in the following nuclei:

$space left parenthesis straight i right parenthesis space straight C presubscript 06 presuperscript 12 space space space space space space left parenthesis ii right parenthesis space straight O presubscript 08 presuperscript 16 space space space space space space left parenthesis iii right parenthesis space Mg presubscript 12 presuperscript 24 space space space left parenthesis iv right parenthesis space Fe presubscript 26 presuperscript 56 space space space space space space space space space left parenthesis straight v right parenthesis space Sr presubscript 38 presuperscript 88$

Solution

space left parenthesis straight i right parenthesis space straight C presubscript 06 presuperscript 12 colon space Atomic space No. space left parenthesis straight Z right parenthesis space equals space 6 space Mass space No. space left parenthesis straight A right parenthesis space equals space 12 space No. space of space proton left parenthesis straight p right parenthesis space equals 6 space No. space of space neutrons space left parenthesis straight n right parenthesis space equals 12 minus 6 space equals space 6 space left parenthesis ii right parenthesis space straight O presubscript 08 presuperscript 16 colon space space Atomic space No. space left parenthesis straight Z right parenthesis space equals space 8 space Mass space No. space left parenthesis straight A right parenthesis space equals space 16 space No. space of space protons space left parenthesis straight p right parenthesis space equals space 8 space No. space of space neutrons space left parenthesis straight n right parenthesis space equals 16 minus 8 space equals space 8

left parenthesis iii right parenthesis space Mg presubscript 12 presuperscript 24 colon space Atomic space No. space left parenthesis straight Z right parenthesis space equals space 12 Mass space No. space left parenthesis straight A right parenthesis space equals 24 No. space of space protons left parenthesis straight p right parenthesis space equals 12 No. space of space neutrons space left parenthesis straight n right parenthesis space equals 24 minus 12 space equals 12 left parenthesis iv right parenthesis space Fe presubscript 24 presuperscript 56 colon space Atomic space No. space left parenthesis straight Z right parenthesis space equals 26 Mass space No. space left parenthesis straight A right parenthesis space equals space 56 No. space of space protons space left parenthesis straight p right parenthesis space equals 26 No. space of space neutrons space left parenthesis straight s right parenthesis space equals space 56 minus 26 space equals space 30 left parenthesis straight v right parenthesis space Sr presubscript 38 presuperscript 88 colon space Atomic space No. space left parenthesis straight Z right parenthesis space equals space 38 Mass space No. space left parenthesis straight A right parenthesis space equals space 88 No. space of space protons space left parenthesis straight p right parenthesis space equals 38 No. space of space neutrons left parenthesis straight n right parenthesis space equals space 88 minus 38 space equals 50

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