Which equation correctly shows the formation of a Group 2 metal ion?
X\text{X}X represents a Group 2 metal and e−\text{e}^-e− represents an electron.
X+2e−→X2+\text{X} + 2\text{e}^- \rightarrow \text{X}^{2+}X+2e−→X2+
X→X2++2e−\text{X} \rightarrow \text{X}^{2+} + 2\text{e}^-X→X2++2e−
X→X2−+2e−\text{X} \rightarrow \text{X}^{2-} + 2\text{e}^-X→X2−+2e−
X+e−→X2++e−\text{X} + \text{e}^- \rightarrow \text{X}^{2+} + \text{e}^-X+e−→X2++e−
Practise OCR GCSE Chemistry Atomic structure with exam-style questions for Foundation and Higher tier. 97 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.