Question

Define S block elements in Modern Periodic Table

Answer 1

• The modern periodic table is an arrangement of all the elements by 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 are called groups.

S block elements:

• The elements of Group 1 and Group 2 of the modern periodic table are called S-block elements.
• There are two possibilities either there is 1 electron in s subshell or 2 electrons in s subshell.
• The s-block elements having only one electron in their s-orbital are called group one or alkali metals.
• The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
• The s block elements having two electrons filling their s-orbital are called group two or alkaline-earth metal.
• The alkaline-earth metal consists of the chemical elements beryllium (Be) magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).