Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
A) Atomic number = 6; atomic mass number = 13
B) Atomic number = 6; atomic mass number = 7
C) Atomic number = 13; atomic mass number = 6
D) Atomic number = 7; atomic mass number = 13

Question

Quizplus · Accepted Answer

Atomic number is the number of protons in an atom, which is 6 in this case. Atomic mass number is the sum of protons and neutrons in an atom, which is 6+7=13 in this case. Therefore, the correct choice is A.

Consider an Atom of Carbon in Which the Nucleus Contains