element - it cannot be broken down into 2 or more simpler substances by chemical process., impure - An ___________ substance melts/boils over a range of temperature. , mercury - silvery liquid, pure - A ___________ substance only consists of one type of substance., potassium - its chemical symbol is 'K'., oxygen - the element of the gas that humans breath in., proton - Elements are arranged according to their ___________ numbers in the Periodic Table., periods - Horizontal rows of the Periodic Table. , groups - Vertical column of the Periodic Table., aluminium - used in building aircraft, making kitchen foil, chemical - Elements in the same group have similar _______________ properties. , selenium - its chemical symbol is 'Se'.,

Elements and Periodic Table

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