A) 40 protons and 20 electrons
B) 20 protons and 40 electrons
C) 20 protons and 20 neutrons
D) 20 protons and 40 neutrons
Correct Answer: C
$ P=, $ 20, mass no. A = 40 $ N=, $ A-P = $ 40-20=20 $
$ P=N=20. $
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