Alkali Earth Metals: Sodium - Na, Lithium - Na, only 1 free electron in their outer shell, incredibly reactive metal, Transition metals: Nickel - Ni, Platinum - Pt, the number of free electrons in their outer shells varies, but it is incomplete, reactivity is less than the alkali and alkaline earth metals but more than nonmetals, Nonmetals: Carbon - C, Oxygen - O, number of electrons in their outer shells varies but they are close to being full, can be very reactive (particularly the halogens), Noble gases: Argon - Ar, Helium - He, You will never see these in experiments, they are incredibly unreactive, their outer shells are completely full,

Testing your knowledge - groups of the periodic table

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