What part of the atom is involved in chemical reactions?

Chemical reactions happen when two or more atoms go together to form molecules or when Atoms brake

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source: