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  • Assertion: The atomic size of helium is smaller than that of neon <img al

Assertion: The atomic size of helium (\text{He}) is smaller than that of neon (\text{Ne}).

Reasoning: Helium has a higher effective nuclear charge compared to neon.

 

Option: 1

Both assertion and reasoning are true, and the reasoning is the correct explanation of the assertion.


Option: 2

Both assertion and reasoning are true, but the reasoning is not the correct explanation of the assertion.


Option: 3

Assertion is true, but the reasoning is false.


Option: 4

Both assertion and reasoning are false.


Answers (1)

best_answer

Helium (\text{He}) and neon (\text{Ne}) are both noble gases in Group 18 of the periodic table. However, helium has two electrons and neon has ten electrons. Due to the higher effective nuclear charge in helium (i.e., the attractive force from the protons in the nucleus) compared to neon, helium has a smaller atomic size. This is because the increased nuclear charge in helium attracts the electrons more strongly, resulting in a smaller atomic size for helium as compared to neon.

 

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Pankaj

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