Why do elements in the same group often react similarly?
They have the same mass number.
They have the same number of protons.
They have the same number of outer-shell electrons.
They have the same number of electron shells.
Flashcards for OCR GCSE Chemistry Predicting chemical reactions, covering the key terms, definitions and equations you need to recall for Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier). 24 cards, matched to the OCR GCSE Chemistry (J248) specification. Recall questions account for roughly 40% of marks at GCSE Chemistry, so these target the marks you can secure before the paper starts.
