Identify the element one that does NOT belong to Group 1 of the Modern Periodic Table.
Sodium
Lithium
Hydrogen
Rubidium
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All the elements listed — Sodium, Lithium, Hydrogen, and Rubidium — are actually found in Group 1 of the Modern Periodic Table, also known as the alkali metals group. However, Hydrogen is unique because it is often placed separately from the alkali metals despite having similar properties in some contexts.
So, while Hydrogen is technically in Group 1, it is sometimes considered not to belong to the alkali metals group in a strict sense due to its distinct characteristics.