What is periodicity?
Periodicity is the trend in chemical and physical properties of the elements across each period of the periodic table.All elements in a period have the same number of shells, all elements in a group have the same number of electrons in their outer shells.Atomic radius decreases across a period and ionisation energy increases.However, there is a drop in ionisation energy between groups 2&3 and 5&6
JA
Related Chemistry A Level answers
All answers ▸Would you expect a calcium ion to be bigger, smaller or the same size as a calcium atom? Give TWO reasons to explain your answer.
Why do branch chained isomers have lower boiling point than straight chain equivalents?
What is meant by the term amphoteric? and give an example of a reaction using NaOH that could be used to distinguish between a solution of amphoteric AlCl3 and non-amphoteric MgCl2.
Aminoethane can be prepared by a reduction reaction. Identify a starting compound that can be used to prepare aminoethane by reduction, give the necessary reagent and write an equation for the reaction.