Search over 10,000 free study notes

Alkenes contain a pi bond, which is a site of high electron density, since it contains a pair of electrons delocalised around the two bonded carbon atoms. Because of this, the pi bond can act as a nucleophil...

Compared to water ice is less dense this is due to hydrogen bonds in the open lattice holding the H 2 O molecules apart whereas in liquid form the hydrogen bonds break allowing the molecules of water to be c...

As you go down group 2, atom size increases. Larger atoms experience more shielding. There is an increase in nuclear charge going down group 2 elements so you would expect the outer electrons to be held more...

The general trend is that the first ionisation energies increase across the period.First ionisation energies increase across the period as from Lithium to Fluorine the nuclear charge is increasing yet the at...

Barium is in the sixth period, Calcium is in the fourth. Therefore, Barium experiences more shielding, resulting in weaker attraction of the nucleus for outermost electrons.