Which among the following is not an alkali metals and does not belong to the Group 1 of Periodic Table? 

The correct answer is Calcium.Key Points

• Calcium is not an alkali metal and does not belong to Group 1 of the periodic table.
• Alkali metals are highly reactive metals that readily lose their outermost electron to form cations with a charge of +1.
• Any of the six chemical elements in Group 1 (Ia) of the periodic table—lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr)—are classified as an alkali metal.
• The reason the alkali metals have that name is because they react with water to produce alkalies, which are powerful bases capable of neutralizing acids.

Additional Information

• Calcium:
  • It is an alkaline earth metal that belongs to Group 2 of the periodic table.
  • The elements in Group 2 of the periodic table have two valence electrons and are less reactive than alkali metals. 
• Lithium:
  • A chemical element with the atomic number 3 and the symbol Li is lithium.
  • It is a delicate, white-silver alkali metal.
  • It is the least dense metal and the least dense solid element under typical conditions.
• Sodium:
  • The chemical element sodium has the atomic number 11 and the symbol Na.
  • It is a delicate, silvery-white metal that is exceedingly reactive.
• Potassium:
  • The chemical element with the atomic number 19 and the letter K is potassium.
  • It is a silvery white metal that may be easily sliced with a knife thanks to its pliability.