put the metals in order of reactivity, most reactive to least reactive. aluminium potassium copper gold iron

answer:

gold, potassium, aluminium, iron, copper

explanation:

i think

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

"the periodic table is arranged in order of atomic number."