periodic table !!

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Terms in this set (...)

period
same number of electron shells

L: metals - R: non-metals

metallic characer decreases from LR
group
same number of valence electrons

metallic character increases down: size of atom increases; valence further and attraction decreases
group I [alkali metals]
one valence electron each

soft and easily cut

low mp and bp [decrease down] and densities [increase down]

highly reactive [increases down]

"alkali metals react with water to form alkali and hydrogen gas"

2K(s) + 2H2O (l) --> 2KOH (aq) + H2 (g)
group VII [ halogens ]
seven valence electrons each

non metals and diatomic molecules

simple covalent molecules

low mp bp [increase down]

coloured substances [darkens down]

highly reactive = one electron away from complete [decreases down]

HALIDES: halogens react vigorously with metals to form salts

metal halides are ionic compounds

non metal halides form covalent compounds

powerful oxidising agents: gain electron readily to form halide ions

DISPLACEMENT REACTION: more reactive halogen displaces less reactive from its salt

eg: Cl2(g) + 2NaBr (aq) --> 2NaCl (aq) + Br2 (aq)
Group VIII [ noble gases ]
group 0

monoatomic non metal gases

unreactive
transition metals
block of metals between group II and III

high mp bp and densities

coloured compounds

variable oxidation states: form ions of different charges
eg: Fe2+ and Fe3+

good catalysts
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