To which group do the alkaline earth metals such as radium, barium and strontium belong?

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Accepted Answer

- Alkaline earth metals (radium, barium, strontium) are members of Group 2 of the periodic table.
- In the older/main group labeling this is written as Group 2A.
- These elements have $2$ valence electrons and typically form ions with charge $+2$.
- Therefore the correct choice is Group 2A, i.e. option (2), which corresponds to label **b**.

FINAL_ANSWER: b

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