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1.
for A
mass no. =3+4=7
atomic no. =3
for B
mass no. =9+8=17
atomic no. =9
for C
mass no. = 8+8=16
atomic no. = 8
for D
mass no. = 9+10 = 9
atomic no. = 9
2. B nd D represent the pair of isotopes
for A
mass no. =3+4=7
atomic no. =3
for B
mass no. =9+8=17
atomic no. =9
for C
mass no. = 8+8=16
atomic no. = 8
for D
mass no. = 9+10 = 9
atomic no. = 9
2. B nd D represent the pair of isotopes
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