1how is the modern periodic table ordered?
by atomic number
2How were the early lists of elements ordered?
by atomic mass
3Why dud Mendeleev swap the order of some elelments?
to group them by their chemical properties
4why did mendeleev swap the order of some elements?
leave room for elelments that had not yet been discovered
5Where are the metals and non metals located on the periodic table?
metals to the left, non metals to the right
6What is the name given to the group one elements?
alkali metals
7Why are the alkali metals named this?
they are metals that react with water to form an alkali
8give the general equations for the reactions of alkali metals with oxygen, chlorine, and water.
metal + oxygen -> metal oxide. / metal + chlorine -> metal chloride. / metal + water -> metal hydroxide + hydrogen
9why does the reactivity of the alkali metals increase down the group?