CHEMISTRY Unit 1.4/1.6 (AQA - Structure of the atom)

Relative electrical charges of a proton, neutron, and electron

Proton: $+1$, Neutron: $0$, Electron: $-1$

Reason atoms have no overall electrical charge

The number of negatively charged electrons is equal to the number of positively charged protons in the nucleus.

Atomic number

The number of protons in an atom of an element.

Characteristic shared by all atoms of a particular element

They possess the same number of protons (different elements possess different numbers of protons).

Nuclear model description of an atom

A central, positively charged nucleus containing protons and neutrons, surrounded by electrons in orbit.