Answer:
true
Explanation:
yea a theory has not tested hypothesis
Isotopes
Atoms of the same element; number of protons remain the same, number of neutrons vary. Chemical properties remain the same. Atomic mass varies.
Na sodium with 11 neutrons = atomic mass of 22
With 22 neutrons the mass is 23.
Both have 11 protons in the nucleus.
I found plenty on why there are different. if you would like a sarcastic answer I would suggest "they both keep swimming, swimming, what do we do we keep swimming swimming. "
