Front

Element

Back

Pure substance that can't be seperated into anything simpler

Front

Atom

Back

the smallest particle of an element that retains the properties of that element

Front

proton

Back

positive particle found in nucleus of atom

Front

neutron

Back

neutral particle found in nucleus

Front

electron

Back

negatively charged particle that travels around nucleus in energy level or shells

Front

Pure substance

Back

made of only 1 type of matter, elements and compounds

Front

Period

Back

horizontal row on a periodic table, elements in the same period have the same number of electron shells

Front

group/family

Back

vertical column on the periodic table, elements in the same group have the same number of valence electrons

Front

nucleus (of atom)

Back

tiny dense centre of an atom, contains protons and neutrons, all the mass comes from the nucleus

Front

electron shell

Back

shell or energy level is the path that electrons travel while orbitting the nucleus