Question : Which of the following elements does not belong to group 1 of the modern periodic table?
Option 1: Sodium
Option 2: Radium
Option 3: Potassium
Option 4: Lithium
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Correct Answer: Radium
Solution : The correct answer is Radium .
- The atomic number of Radium is 88 it belongs to group 2 of the periodic table.
- The chemical elements lithium, sodium, potassium, rubidium, caesium and francium are present in group 1 of the periodic table. These elements make up the alkali metals.
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