Question

What are the following groups known:

Group 1A

Answer 1

Modern periodic table:

• The modern periodic table is an arrangement of all the elements known in accordance with their increasing atomic number and recurring chemical properties.
• It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns called groups.
• All elements in a group have the same number of valance electrons, and in period elements have the same number of electron shells.

Group 1A :

• This group is of alkali metals.
• The alkali metals are so called because of their reaction with water to form water-soluble bases called alkalies.
• They occupy the first column of the periodic table.
• They are highly electropositive and reactive metals as their valance shell has one electron.
• Alkali elements are Lithium($\mathrm{Li}$), Sodium($\mathrm{Na}$), Potassium ($\mathrm{K}$), Rubidium ($\mathrm{Rb}$), Cesium ($\mathrm{Cs}$), and Francium ($\mathrm{Fr}$).