Which element is the lightest and most abundant chemical element in the universe?
ALithium
BHelium
CHydrogen
DCarbon
Explanation
Hydrogen is the lightest element (atomic number 1) and constitutes ~75% of elemental mass in the universe.
Exam Relevance
- Topic: Physical Sciences, Chemistry & Technology
- Subtopic: SI Units, Instruments, Chemical Compounds & Optics

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