Which group contains elements that exist as monoatomic molecule?
Correct answer: D. 18
- A. 1
- B. 2
- C. 14
- D. 18
Explanation
Group 18 elements have completely filled valence shells, and their atoms exist independently rather than forming ordinary diatomic or polyatomic molecules. They are therefore monoatomic gases, making option d correct. Students may choose group 1 or 2 because metals are often represented by individual atoms in formulas, but those groups do not exist as monoatomic gases under ordinary conditions.
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About Blocks of the Periodic Table
Electron configurations divide elements into s, p, d and f blocks according to the subshell receiving the last electron. Work includes the positions, valence-shell configurations and general properties of s-block and p-block elements, along with periodic trends in atomic size, ionisation energy, electron affinity and electronegativity.
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