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Periodic classification and periodicity
Class 12 · Chemistry · 5 questions
Name: ____________________ Date: ____________
Ionisation energy generally across a period from left to right:
- A Decreases
- B Increases
- C Stays constant
- D Becomes zero
Which element has the highest electronegativity?
- A Fluorine
- B Oxygen
- C Nitrogen
- D Chlorine
Atomic radius down a group:
- A Decreases
- B Is constant
- C Doubles each time
- D Increases
Which of these has the largest radius?
- A Na
- B Cl
- C Mg
- D Al
Electron affinity is the energy change when an atom:
- A Gains a proton
- B Gains an electron
- C Gains a neutron
- D Loses an electron
Answer key
1. B, 2. A, 3. D, 4. A, 5. B
Nuclear charge rises and atomic size falls, so electrons are held more tightly.
Fluorine is the most electronegative element.
More shells are added.
Radius falls across period 3, so Na is the largest.
It measures how readily an atom accepts an electron.