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 ▸What affects the rate of reaction?
Explain in terms of particles and collisions how concentration, temperature and addition of a catalyst affect the rate of a reaction.
Potassium forms an ionic compound with sulfur. Describe what happens when atoms of Potassium react with atoms of sulfur. Give your answer in terms of electron transfer.
How do I know the formula for salts formed in a reaction?