s-Block Elements Test - 1

Alkaline earth metals are called so because of two reasons

1. Alkaline earth metals are obtained on earth in the form of ores
2. Oxides and hydroxides of Alkaline earth metals are basic in nature.

However Beryllium fulfills 1st reason but its oxides and hydroxides are amphoteric so sometimes they say it is not alkaline earth metal. but as it is amphoteric IUPAC has accepted this as alkaline earth metal

Lithium shows diagonal relationship to Magnisium due to their nearly same polarising power, comparable electronegativities(Li=1.00, Mg=1.20) and small difference in radius (Li=152Pm, Mg=159pm).

Group I (ns¹) elements  react vigorously with water to produce an alkaline solution thus collectively known as alkali metals

Na and K ions help in transmission of nerve impulses , in regulating the flow of water accross the cell membranes and in the transport of sugar and amino acids in to cells. so monovalent sodium and potassium ions found in large proportions in biological fluids

s block comprises of only two groups alkali metal group and alkaline earth metal groups