Alkali dhaatu

Alkali metals, periodic table me kuchh element ke ek group hae. Ii group ke sab element ke silver rang rhae hae, ii naram hae aur iske sab se bahaar waala cell me khaali ek electron hae. Ii group ke element, reactions me ii ek electron ke de de hae aur +1 ke charge hoe jaawe hae. Nature me ii group ke metal kabhi pure form me nai mile hae kaahe ki ii bahut reactive hae. II noble gas ke chhorr ke aur sab element se react kare hae. Hawaa me ii karia hoe jawe hae. 

Alkali metals hae: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), aur Francium (Fr). Lithium sab se kamti reactive, aur francium sab se jaada reactive, hae.

Sodium ek khaas alkali metal hae jisse sodium chloride (NaCl) (khaae waala nimak) aue sodium hydroxide (NaOH), ('caustic soda') bane sake hae jon ki ek bahut tagrraa base hae.