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Lithium and beryllium, the first members...

Lithium and beryllium, the first members of alkali metals group and alkaline earth metals group, show anomalous behaviour due to the small sizes of their atoms and ions, high ionisation enthalpies, high polarizing power and absence of vacant d-orbitals in their valence shell. Lithium resembles magnesium while beryllium resembles aluminium due to diagonal relationships.
Lithium is the only alkali metal which forms nitride directly. Why?

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To understand why lithium is the only alkali metal that forms nitride directly, we can break down the explanation into several key points: ### Step-by-Step Solution: 1. **Understanding Alkali Metals and Their Characteristics**: - Alkali metals (group 1) include lithium (Li), sodium (Na), potassium (K), etc. They have one electron in their outermost shell, which they readily lose to form cations with a +1 charge. 2. **Size and Ionization Energy**: ...
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