Identify the element one that does NOT belong to Group 1 of the Modern Periodic Table.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. Hydrogen.
The element that does not belong to Group 1 of the Modern Periodic Table is Hydrogen. Although hydrogen is placed at the top of Group 1, it is not considered an alkali metal like Sodium, Lithium, and Rubidium, which are all part of Group 1. Hydrogen is a unique element with properties that differ significantly from those of alkali metals, making it distinct despite its position in the same column.