What is ionization energy?

Energy required to remove an electron from an isolated gaseous atom

Energy released when an electron is added

Energy required to add a proton

Energy required to remove a neutron

What is first ionization energy?

Energy required to remove the first electron

Energy required to remove the second electron

Energy released by the first electron

Energy required to add the first proton

Which electron is generally removed first from an atom?

The most loosely bound electron

The most tightly bound electron

Class 9 Chemistry · Chapter 8 · Test 5

Ionization Energy Trends

24 MCQs covering ionization energy, first ionization energy, removal of electrons from gaseous atoms, the effect of atomic size and nuclear attraction, and the trends of ionization energy across periods and down groups.

MCQs

24 questions · 20 min · 24 marks

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Sample questions

The first 5 of 24. Try each one, then tap to see the answer.

Question 1
What is ionization energy?
- AEnergy released when an electron is added
- BEnergy required to remove an electron from an isolated gaseous atom
- CEnergy required to add a proton
- DEnergy required to remove a neutron
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Answer: B
Ionization energy is the energy required to remove the most loosely bound electron from the valence shell of an isolated gaseous atom.
Question 2
From which type of atom is ionization energy measured?
- ASolid atom
- BLiquid atom
- CIsolated gaseous atom
- DMetallic atom
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Answer: C
The definition of ionization energy refers to an isolated gaseous atom.
Question 3
What is first ionization energy?
- AEnergy required to remove the first electron
- BEnergy required to remove the second electron
- CEnergy released by the first electron
- DEnergy required to add the first proton
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Answer: A
First ionization energy is the energy required to remove the first electron from an isolated gaseous atom.
Question 4
Which electron is generally removed first from an atom?
- AThe most tightly bound electron
- BThe most loosely bound electron
- CA proton
- DA neutron
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Answer: B
The most loosely bound electron in the valence shell requires the least energy to remove.
Question 5
What happens to ionization energy generally from left to right across a period?
- AIt decreases
- BIt increases
- CIt remains constant
- DIt becomes zero
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Answer: B
Ionization energy generally increases from left to right across a period.

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