Which of the following elements has an atomic number of 8?

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper

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Answer 1

The correct answer is Oxygen.

Key Points

Oxygen is a chemical element with the atomic number 8.
It is represented by the symbol O in the periodic table of elements.
Oxygen is a highly reactive non-metal and an oxidizing agent that readily forms oxides with most elements and compounds.
It is essential for most life forms on Earth, as it is a critical component of cellular respiration.
Oxygen constitutes about 21% of the Earth's atmosphere by volume.
It is also a part of water (H₂O) and is necessary for combustion processes.
Oxygen was discovered independently by Carl Wilhelm Scheele and Joseph Priestley in the 1770s.

Additional Information

Hydrogen
- Hydrogen is the lightest and most abundant element in the universe, with the atomic number 1.
- It is represented by the symbol H.
- Hydrogen is primarily found in water (H₂O) and is essential for the formation of many compounds.
Nitrogen
- Nitrogen is a chemical element with the atomic number 7.
- It is represented by the symbol N.
- Nitrogen makes up about 78% of the Earth's atmosphere and is a crucial component of the biosphere and ecosystems.
Carbon
- Carbon is a chemical element with the atomic number 6.
- It is represented by the symbol C.
- Carbon is the basis of all known life on Earth, forming the backbone of organic chemistry.