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Which of the noble gases has the greatest ionization ener...

Which of the noble gases has the greatest ionization energy

A.

He

B.

Xe

C.

Ar

D.

Rr

View answer & explanation

Correct answer is A

Ionization energy: The amount of energy required to remove an electron from an isolated atom or molecule.

Trends down group :

Ionization energy decreases down the group.
This is due to the shielding or screen effect of the outer electrons from the nucleus.
The attraction is weaker and they are more easily removed.
Helium and radon both belong to group 8 which are called noble gases.
Helium (He) has the highest ionization energy and Radon (Rn) has the lowest ionization energy.

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