Lesson 1

Lesson 1:
Atom, Proton, Neutron and Electron
I learnt that the atom is the smallest unit of an element, having the properties of the element. In other words, the atom is the building blocks of life. Each atom is millions of times smaller than the thickness of a regular piece of paper. There are many ways to represent an atom such as the Bohr model and the Rutherford model. 

Each atom consists of protons, neutrons and electrons, symbolized by a 'p', a 'n' and an 'e' respectively.

PROTON:         Positive charge                    Relative mass of 1

NEUTRON:      No charge                            Relative mass of 1

ELECTRON:    Negative charge                  Relative mass of 1/1836

There is an equal number of protons and electrons in an atom so as to maintain a neutral charge of the atom.