Question

what is s-block element ? ​

Answer 1

In modern periodic table group 1 and group 2 elements except Hydrogen are known as S block elements since last electron enters in S orbital on their electronic configuration.

They are:-

Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium(Fr), Beryllium(Be), Magnesium(Mg), Calcium(Ca), Strontium(Sr), Barium(Ba) and Radium(Ra).

Answer 2

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S-block elements are the elements found in Group 1 and Group 2 on the periodic table. Group 1 are the alkali metals which have one valence electron. They have low ionization energies which makes them very reactive. Group 2 is the alkali earth metals which have two valence electrons, filling their s sublevel.