The red sphere represents a proton.
what is the atomic number of this atom?
explain how you found the atomic number.

What were the success and failures that came to boyle’s excitements?

Which type of reaction always has an element and a compound as reactants

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?