Question

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Atom A has an atomic number of 19 and mass number of 40. Atom B has an atomic number of 20 and a mass number of 40.

Which of these is an accurate statement?

A) Atom A has more protons than Atom B.

B) Atom A has one less proton and one more neutron than Atom B.

C) Atom A has an extra nucleon compared to Atom B.

D) Atom A has one more proton and one more electron than Atom B.

Answer 1

Answer: C

Explanation: this is called an isotope which has equal number of protons but different numbers of neutrons in the nucleus hence different atomic mass but no difference in chemical properties.