Argon (Ar) has an atomic number of 18 and an atomic mass of 40. How many...

Question

Question

Argon (Ar) has an atomic number of 18 and an atomic mass of 40. How many neutrons are there in an atom of Argon? A. 18 B. 20 C. 22 D. 40

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Answer 1

Answer #1

Mass number(40) denotes number of protons and neutrons in the nucleus.

No. of protons = Atomic number =18

mass number= no. of protons +no. of neutrons

mass number - no. of protons = no. of neutrons

40 -18 = 22 = no. of neutrons

Correct answer = C

Answer 2

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