Question : Identify an anomaly element that belongs to both Group 1 and Group 17.
Option 1: Oxygen
Option 2: Hydrogen
Option 3: Chlorine
Option 4: Nitrogen
Correct Answer: Hydrogen
Solution : The correct answer is Hydrogen .
There is an unusual occurrence in the Modern Periodic table concerning the position of Hydrogen (H). During the first period, Hydrogen can be found in either Group 1 or Group 17. Group 1, known as the alkali metals, is formed when Hydrogen reacts with halogens. However, to be included in Group 17 - the halogen group, Hydrogen must also be considered a diatomic molecule because it can form ionic compounds with metals.
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