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Structure Of Atom

Question
CBSEENCH11005214

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