True: Form diatomic molecules, Reactivity decreases moving down the group, Form ions with a -1 charge, Decrease in colour moving down the group, Electronegativity decreases moving down the group, Larger molecular mass = larger surface area for IMF, Fluorine forms a highly polarised bond with hydrogen, Nuclear charge increases moving down the group, Chlorine has a higher first ionisation energy than bromine, A reducing agent is oxidised, False: Are group 0 elements, Atomic radius decreases moving down the group, Lose electrons when they react with metals, Have no useful properties, Fluorine is the least electronegative, Melting and boiling points decrease moving down the group, Form polar covalent bonds with atoms of the same element, Shielding decreases moving down the group, Oxidation is the gain of electrons, Covalent bonds break when a substance changes state,

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