Class 9 Exam > Class 9 Questions > Which atom is the smallest atom of all?a)Lith...
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Which atom is the smallest atom of all?
- a)Lithium
- b)Helium
- c)Hydrogen
- d)Carbon
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which atom is the smallest atom of all?a)Lithiumb)Heliumc)Hydrogend)Ca...
Explanation:
Factors Affecting Atomic Radius:
Comparison of Atomic Radii:
Conclusion:
The size of an atom is determined by its atomic radius, which is the distance from the center of the nucleus to the outermost electron. Therefore, the smallest atom will have the smallest atomic radius.
Factors Affecting Atomic Radius:
- Number of protons in the nucleus
- Number of energy levels or electron shells
- Effective nuclear charge
Comparison of Atomic Radii:
Based on the factors affecting atomic radius, we can compare the atomic radii of the four given elements:
- Hydrogen has only one proton and one electron, making it the smallest atom.
- Helium has two protons and two electrons, making it slightly larger than hydrogen.
- Lithium has three protons and electrons, and is larger than both hydrogen and helium.
- Carbon has six protons and electrons, and is larger than all three previous elements.
Conclusion:
Therefore, the smallest atom of all is Hydrogen, with only one proton and one electron.
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Community Answer
Which atom is the smallest atom of all?a)Lithiumb)Heliumc)Hydrogend)Ca...
The atom with the smallest mass is the hydrogen atom; its mass is about 10-27 kg.
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Which atom is the smallest atom of all?a)Lithiumb)Heliumc)Hydrogend)CarbonCorrect answer is option 'C'. Can you explain this answer?
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