How many grams are in 2.25 x 1023 atoms Na Write answer with correct sig figs.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

C. definite shape, definite volume. that is a solid.

Mg-26 and mg-24 are pair of isotopes. isotopes are defined as atoms of the same element having same atomic number but different mass number. i hope that was .