According to this law, mass is neither created nor destroyed during ordinary chemical reactions or physical changes

Atoms can't be destroyed

It is the smallest particle of an element that retains the chemical properties of that element

The isotope above is written in this type of notation

This is the mass number for this isotope

These are short-range forces (proton-proton, proton-neutron, & neutron-neutron) that hold the nuclear particles together.

 $6.022\times10^{23}$  

is known as ____________ number

Avogadro's number, $6.022\times10^{23}$ , represents the following in one mole of a substance

It is the mass of one mole of a pure substance