Accompanying Lesson Plan: Lesson 3.2 ... of the atoms and their mass has a lot to do with the density of the substance Another factor is how the atoms are arranged in the substance. Polyethylene is ...

It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of electrons ... isotopes of hydrogen: hydrogen, deuterium (hydrogen-2) and tritium (hydrogen-3): if the atom loses ...

An element's atomic number defines it ... There are three isotopes of hydrogen: hydrogen, deuterium (hydrogen-2) and tritium (hydrogen-3): Carbon has three isotopes: \(_{6}^{ ...