Question

lithium, sodium, potassium belong to same group called alkali metals. why?? ​

Answer 1

Answer:

Li, Na and K all ended up in the Alkali Metals group because of this pattern that grouped similar elements. They have similar chemical properties because they all have one valence electron which they lose easily to form a +1 ion. They all react vigorously with water to form hydrogen gas and hydroxide ion.

Answer 2

Answer:

Lithium, Sodium, Potassium and few more elements belong to this group in the extended form of modern periodic table.

• These metals are placed in the first group i.e. Group 1 or Group 1A of periodic table.

These are popularly known by the name of "alkali metals" because they form very strong alkalis when reacted with water.

• Now, we heard a term "alkali". Let's know about it as well! Alkali is simply defined as a soluble compound(base) which on dissolving in water produce only hydroxide ions. It can be simply said that alkalis are " water soluble bases". Strong alkalis are the ones that furnishes more hydroxide ions when dissolved in water.

The metals of this group have only one electron in their valence shell and are hence, very reactive. They are mostly found in combined state in nature.

• They have a number of chemical and physical properties in common. One such example is, all of them are strong alkalis(as discussed above).

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