Question

Which of the following best describes the subatomic particles

A. there are 20 protons, 20 electrons, and 40 neutrons
b. there are 20 protons, 20 electrons, and 60 neutrons
c. there are 20 protons, 20 electrons, and 20 neutrons
d. there are 40 protons, 40 electrons, and 20 neutrons

Answer 1

I am guessing that the 20 is the mass number? If so it is D. If 40 is the atomic number we know right away that there is 40 protons and 40 electrons. To find the number of neutrons we do Atomic Number - Mass Number, which in this case is 40 - 20 which of course equals 20.

Answer 2

i will accept with ccswims