Definition
Periodic Table is a list of elements arranged in order of increasing proton (atomic) numbers
Features of the Periodic Table
Important Information:
Non metals with 7 valence electrons are generally poor conductors of electricity → as they do not have free electrons to carry an electric charge
Elements with 7 valence electrons usually form diatomic molecules rather than monatomic in their natural state.
Sample
explain why no elements in group 18 are shown in the table depicting oxidation states All elements in table have a possible oxidation state which imply they can be chemically bonded with another element OR table does not show grp 18 elements as there are non with oxidation state 0 Group 18 elements are inert because they have stable electronic configuration with fully filled valence shell and thus will not chemically bond with other elements