chemistry atomic strucure

atom

a building block of matter (smallest unit of an element)

nucleus

positively charged centre of an atom held by a nuclear force

protons

positively charged subatomic particles in the nucleus

neutron

a neutral subatomic particle in the nucleus

electron

a negatively charged subatomic particle outside the nucleus

atomic number

number of protons in the nucleus

mass number

total amount of protons and neutrons in the nucleus

isotope

Atoms of the same element with different numbers of neutrons

electrostatic force

attractive/repulsive forces between particles caused by their electric charges

electron shell

area surrounding the nucleus where electrons are found

valence shell

the outermost shell of an atom with electrons that determine its properties and behaviour

bohr model

a structure of an atom where electrons travel on fixed orbits around a nucleus

electron configuration

distribution of an atoms electrons in its shells

chemical symbol

1-3 letter combinations used to represent an element

chemical formula

a symbol representation of a substances composition