The nucleon number of element X is 19 and has 10 neutrons in its nucleus. Which element has the same chemical properties as element X?
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Correct option is 16
Atomic number =15= No. of electrons= No. of protons
Mass Number = 31
Number of neutrons + number of protons= Atomic mass number.
∴ Number of neutrons =31−number of protons
=31−15
=16
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