Question

identify the odd one out. 1. Rb. 2.Ra. 3.Sr. 4.Be. ​

Answer 1

Ra is the odd one out element here.

1) All other elements i.e. Rb or Rubidium, Sr or Strontium, Be or Beryllium belong to the Beryllium family of the periodic table i.e. the Second group of periodic Table.

2)While Ra or Radon is a part of Inert Gas Family i.e. Group 18 of periodic table.

Answer 2

Answer:

1.Rb is the odd one out here.

Explanation:

Because Ra (Radium), Sr (Strontium), and Be (Beryllium) are alkaline earth metals and belongs to 2nd group of the modern periodic table.

But Rb (Rubidium) is the alkali earth metal and belongs to 1st group of the modern periodic table.