ESS
Grade-9
Easy
Question
The original two elements of universe are___________.
- Hydrogen, carbon
- Neon, hydrogen
- Helium, lithium
- Hydrogen, helium
Hint:
The first elements of the periodic table.
The correct answer is: Hydrogen, helium
- The original two elements or first elements of universe is- hydrogen(H) and helium(He).
- It took 380,000 years for electrons to confine themselves in orbits around the nucleus to form the first atom.
- These are the most abundant element in the universe.
- So, the correct option is d.
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