9.09.7 KEYWORDS

· Noble Gas – Unreactive gas in Group 0

· Group 0 –right-hand group on Periodic Table

· Inert – Unreactive (Grp 0 elements don’t need to gain, lose or share electrons)

· Alkali Metals – Group 1 elements

· Halogens – Group 7 elements

· Diatomic Molecules – groups of 2 atoms eg F₂, Cl₂, Br₂, I₂

· Displacement – when an element takes the place of a less reactive element in a compound

· Transition Metals – Metals in the block between Grp 2 and Grp 3, have the properties of typical metals

· Catalysts – substances that speed up reactions without being used up.