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The Halogens decrease in reactivity as you descend through the group. The atoms increase in size and Mr as you go down the group. Therefore their outer electrons are further away from the positive charge ...
Magnesium loses two electrons which are transferred to the oxygen atom (so oxygen gains two electrons). In this way, both magnesium and oxygen will acheive a stable full outer shell of electrons. The elec...
Atoms of the same element with different numbers of neutrons
moles = mass/mrn = 6/12n= 0.5
Add one of the following: barium chloride, barium hydroxide, barium nitrateObservation with potassium nitrate: colourless solution/ or no visible change or reaction) Observation with potassium sulfate: wh...
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