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3 marks so 3 points = chlorine's outer electrons are closer to the nucleus than iodine's (because chlorine has fewer shells)//so chlorine's nucleus is more attracted to its outer electrons than iodine's n...

Iron (III) / Fe3+ Mr = 56Oxygen / O Mr = 16
Iron (III) Oxide formula = Fe2O3
2x Iron (III) = 56 * 2 = 1123x Oxygen = 16 * 3 = 48
48 + 112 = 160
Fe2O3 relative formula mass = 160

Crude oil heated and fed into the bottom of the fractionating column as a vapour. The column is cooler at the top and hotter at the bottom of the column. The process works using the different boiling and ...

Covalent bonds are formed as a result of the sharing of pairs of electrons between atoms in order to attain a full outer shell. This typically will happen between two non metals. An ionic bond has the sam...