Which of the following elements are included in the same group in the periodic table?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. H, Li, Na, K.
The elements hydrogen (H), lithium (Li), sodium (Na), and potassium (K) are all in the same group. However, lithium (Li), sodium (Na), and potassium (K) are in the same group, which is Group 1 (the alkali metals). Hydrogen (H), although often placed in Group 1 due to its single electron, does not share the same chemical properties as the alkali metals and is typically considered separately.