Identify the element one that does NOT belong to Group 1 of the Modern Periodic Table,

Correct option is C

The correct answer is (c) Hydrogen
Group 1 Elements (Alkali Metals):
 Group 1 of the Modern Periodic Table is known as the alkali metals group.
 Elements in this group include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr).
 These elements have similar chemical properties, such as having one electron in their outermost shell, which they readily lose to form positive ions (cations) with a +1 charge.
Hydrogen (H):
 Hydrogen is placed above Group 1 in the periodic table, but it is not considered an alkali metal.
 Although hydrogen has one electron in its outermost shell, similar to the alkali metals, its properties are quite different from those of Group 1 elements.
 Hydrogen is a non-metal and typically exists as a diatomic gas (H2) under standard conditions.
 It can form both positive ions (H+) and negative ions (H-), which is not characteristic of alkali metals.

Information Booster:
Sodium (Na):
 Sodium is an alkali metal and belongs to Group 1 of the Modern Periodic Table.
 It is highly reactive and forms a +1 ion by losing its single valence electron.
Lithium (Li):
 Lithium is the first element in Group 1 of the Modern Periodic Table.
 It shares the common properties of alkali metals, including having a single valence electron that it loses to form a +1 ion.
Rubidium (Rb):
 Rubidium is also an alkali metal and belongs to Group 1.
 It is highly reactive and has similar properties to other alkali metals, forming a +1 ion.