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Periodic classification and periodicity
5 Class 12 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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Ionisation energy generally across a period from left to right:
- 1 Decreases
- 2 Increases
- 3 Stays constant
- 4 Becomes zero
Show answer
Correct answer: Increases
Nuclear charge rises and atomic size falls, so electrons are held more tightly.
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Which element has the highest electronegativity?
- 1 Fluorine
- 2 Oxygen
- 3 Nitrogen
- 4 Chlorine
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Atomic radius down a group:
- 1 Decreases
- 2 Is constant
- 3 Doubles each time
- 4 Increases
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Which of these has the largest radius?
- 1 Na
- 2 Cl
- 3 Mg
- 4 Al
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Electron affinity is the energy change when an atom:
- 1 Gains a proton
- 2 Gains an electron
- 3 Gains a neutron
- 4 Loses an electron
Show answer
Correct answer: Gains an electron
It measures how readily an atom accepts an electron.