sodium chlorate (I) solution, bleach

Metal-metal bonds get stronger. The metal ions have an increasing positive charge, increasing number of delocalised electrons and decreasing radius

Solubility increases down the group

A reaction in which one species is simultaneously oxidised and reduced

Decreases. Ions get bigger but delocalised electrons and charge stay the same.delocalised electrons get further away from nucleus, easier to break bonds

It increases. Attraction between nucleus and outer electrons weakens down the group as the ions get bigger and there is more shielding

How many electrons are in the outer shells

to see images of soft tissues in the body on xrays

Decreases due to extra electron shells which causes increased shielding. Extra shells mean outer electrons are further away from the nucleus weakening attractio

Proton number

Silver nitrate (and dilute nitric acid)

Extra electron shells are added as you go down the group