MCQ
Which atom contains exactly $15$ neutrons?
- ✓$ \mathrm{P}^{32}(\text { atomic number }=17) $
- B$ \mathrm{S}^{32}(\text { atomic number }=16) $
- C$ \mathrm{O}^{15}(\text { atomic number }=8) $
- D$ \mathrm{N}^{15}(\text { atomic number }=7) $
✓
Answer
Correct option: A.
$ \mathrm{P}^{32}(\text { atomic number }=17) $
mass number $=$ no.of protons $+$ no.of neutrons
Given that mass number of $P = 32$
Atomic number $($no. of electrons $=$ no. of protons$) = 17$
Number of neutrons $= 32 − 17 = 15$
Hence, $P$ satisfies the requirement.
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