Question

With reference to the long form of the periodic table fill in the blanks with appropriate words.

______metals and alkaline______metals are placed in group 1A and 2A respectively on the left-hand side of the periodic table.

• A. Alkali
• B. earth

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 are called groups.

Alkali Metals:

• 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).
• They are highly reactive and electropositive metals.

Alkaline-earth metals:

• 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).
• They are also reactive but their reactivity is less than that of alkali metals.

Therefore, Alkali metals and alkaline earth metals are placed in groups 1A and 2A respectively on the left-hand side of the periodic table.