The number of protons and neutrons in an atom of argon-38 is:
A) 38 protons and 18 neutrons.
B) 18 protons and 20 neutrons.
C) 18 protons and 38 neutrons.
D) 38 protons and 56 neutrons.
E) 18 protons and 56 neutrons.
Correct Answer:
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