Solution: The answer is 1800NA1800N_A1800NA . i.e option C.
Atomic number =P=8=P=8=P=8 .
Atomic Mass =N+P=17.= N+P = 17.=N+P=17.
Therefore N=9,N = 9,N=9, Which is number of neutrons.
Total number of neutrons in 12×1025atoms=9×12×1025=9×12×1025×NA6×102312\times10^{25} atoms = 9\times 12\times 10^{25}=\frac{9\times12\times10^{25}\times N_A}{6\times10^{23}}12×1025atoms=9×12×1025=6×10239×12×1025×NA
=1800NA=1800N_A=1800NA .
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