Which one is not member of Alkali metals?
Correct answer: D. Mg
- A. Na
- B. K
- C. Cs
- D. Mg
Explanation
Magnesium belongs to group 2A which are the alkaline earth metals; the rest of the elements above are alkali metals.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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