Question

chem

Answer 1

the number of protons in all strontium isotopes is the same

if mass number = protons + neutrons, what's causing the difference in mass number?

Answer 2

Hmm, one proton? o.O

Answer 3

remember, we said that all strontium isotopes have the same number of protons

Answer 4

One neutron

Answer 5

if mass number = # of protons + # of neutrons
and the # of protons is the same for all isotopes

then what is causing isotopes to have different mass numbers?

Answer 6

good, one neutron