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Chemistry Unit 1.6: Groups 1 and 2
Physical properties
The atomic radius increases as you go down group 1 and group 2. This is because the radius of an
atom is governed by two factors:
the number of layers of electrons around the nucleus
the pull the outer electrons feel…

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Rubidium and caesium - Both metals catch fire in air and produce superoxides, RbO2 and CsO2.
The equations are the same as the equivalent potassium one.
Chlorine
All the group 1 metals react with chlorine in the same way they do with the oxides except they only
ever form the…

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Reaction with dilute acids - These simple oxides all react with an acid to give a salt and water.
For example, sodium oxide will react with dilute hydrochloric acid to give colourless sodium
chloride solution and water.
The peroxides
Reaction with water - If the reaction is done ice cold…

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If "X" represents any one of the elements:


The carbonates become more stable to heat as you go down the Group.
Heating nitrates
All the nitrates in this Group undergo thermal decomposition to give the metal oxide, nitrogen
dioxide and oxygen.
Again, if "X" represents any one of the elements:…

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