Question

Which isotopes have the same number of neutrons?

superscript 12 over subscript 6 C

superscript 19 over subscript 9 F

superscript 20 over subscript 10 Ne

superscript 23 over subscript 11 Na

Answer 1

@NoDino

Answer 2

@agreene

Answer 3

So, to find the number of neutrons you will want to subtract the mass number from the number of protons (protons = electrons = bottom number)

12-6 = 6 neutrons
19-9 = 10 neutrons
20 - 10 = 10 neutrons
23 - 11 = 12 neutrons

so F-19 and Ne-20 have the same number of neutrons

Answer 4

I didn't say that very clear:

Neutrons = Mass number - Protons
Protons = Electrons = Atomic Number

Answer 5

okay thanks for the help