A) $ 6\times 10^{18} $
B) $ 7\times 10^{19} $
C) $ 8\times 10^{20} $
D) $ 9\times 10^{21} $
Correct Answer: A
[a] Number of protons $ =\frac{1C}{1.66\times {{10}^{-19}}C}\approx 6\times 10^{8} $
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