The atomic mass number of common oxygen is 16 because it has ___ protons and ___ neutrons.
A) 7; 9
B) 8; 8
C) 9; 7
D) 5; 11
E) 10; 6

Question

Quizplus · Accepted Answer

The atomic mass number is the sum of the number of protons and neutrons in the nucleus of an atom. Common oxygen has 8 protons, which is its atomic number, and 8 neutrons, which gives a total of 16. Choice B is the only option that matches this.

The Atomic Mass Number of Common Oxygen Is 16 Because