Why are the elements of group-$2$ known as alkaline earth metals?
- AThey are found in the earth's crust and their oxides are acidic.
- BThey are found in the earth's crust and their oxides/hydroxides are alkaline.
- CThey are found in the atmosphere and their oxides are basic.
- DThey are found in the earth's core and their hydroxides are neutral.
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