What does neutral mean in chemistry?

It could be one of two things (that I know of!!) Liquids and solutions are usually acidic or alkaline. If acidic it will liberate hydrogen ions, if alkaline it will liberate hydroxy ions. Acidicity (or alkalinity) is measured on the pH scale ( pH is equal to the negative logarithm to the base 10 of the hydrogen ion concentration), a pH below 7 is determined as acidic and above 7 as alkaline. If the pH value is 7 then the solution is pH neutral. The other thing it could be is to do with the charge of the particles. The whole basis of chemisty is atoms ,these are what make up everything! Atoms are essentially made of 3 things protons and neutrons which make up the central nucleus and electrons which spin around the nucleus. As you may have guessed protons are deemed positively charged and electrons negatively charged whilst neutrons have no charge. Atoms have the same number of protons and electrons and so the positive and negative charges cancel out i.e it is neutral. A lack of electrons or additional electrons in an atom (actually called an ion) results the particle having a net positive or negative charge.