Property
| Li | Na | K | Rb | Cs |
| Atomic Number ($Z$) | $3$ | $11$ | $19$ | $37$ | $55$ |
| Electronic Configuration | [He] $2{s^1}$ | [Ne] $3{s^1}$ | [Ar] $4{s^1}$ | [Kr] $5{s^1}$ | [Xe] $6{s^1}$ |
| Ion | $L{i^ + }$ | $N{a^ + }$ | ${K^ + }$ | $R{b^ + }$ | $C{s^ + }$ |
| Atomic Radius ${A^ \circ }$ | $1.34$ | $1.54$ | $1.96$ | $2.11$ | $2.25$ |
| Flame Colouration | Crimson Red | Golden Yellow | Violet | Red Violet | Blue |
- The group $1$ consists of six elements: Lithium(Li), Sodium(Na), Potassium(K), Rubidium(Rb), Caesium(Cs) and Francium(Fr) are called alkali metals because their solution in water is highly alkaline in nature. All these elements are paramagnetic.
- Li is the lightest element and the strongest reducing agent. Rb and Cs are highly electropositive. Fr is radioactive and has very short life span.
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