Answer:
7
Explanation:
Na2 SO4 is the chemical identity. You can count the number of atoms just by looking
sorry but if you are looking for an answer I don't know one. :(
Elements can be defined by their unique properties and atomic.
Answer:
the mass number
Explanation:
Isotopes are numerous forms of one single element. In simple terms, atomic weights are different for the isotopes. Isotopes refer to the atoms that have the same number of protons but different neutron numbers. The physical properties of the isotopes vary because these properties also based on mass. These variations can be used to distinguish isotopes of an element from each other by applying methods such as fractional distillation and diffusion.