If it has a metal and a nonmetal. Not sure if this helps, but I hope it does :)
I believe it is 65.37.
Let me know if this is correct. Also good luck!!
Answer:
Thomson--atoms cotain electron
Ernest Rutherford--atoms have a positive nucleus
R.A Millikan--electrons have Q=-1
Dalton--atoms are indivisible
They would find out by studying hard and researching different things on which is more important
