Describe how elements are arranged in the periodic table
Elements in the periodic table are arranged in order of increasing atomic (proton) number. Elements with the same number of electron shells are arranged in the horizontal rows (periods), and elements with similar properties are arranged in vertical columns (groups). Elements in the same group have similar chemical properties because they have the same number of outer electrons (the same valency).
GC
Related Chemistry GCSE answers
All answers ▸How do I work out the formula of ionic and covalent compounds?
Describe what the Activation Energy for a reaction is.
Describe the differences in properties between diamond and graphite.
How can you distinguish between an endothermic reaction and an exothermic reaction based on temperature change of the surroundings.