Quick answer: Periodicity means that properties repeat across the periodic table. This Chemistry 11-12 test on periodicity has 8 questions worth 20 marks, to do in 45 minutes: ionisation energy, shrinking atoms and sulfur and phosphorus. The mark scheme is on a separate page; free printable PDF.
This chemistry grades 11-12 test on periodicity test works like a real class test. The mark scheme is on a separate page, so revise with the lesson first.
This test checks your understanding of period 3 trends. Answer every question, show working for calculations and name the particles and forces in each explanation. Marks are shown beside each part.
Level: Chemistry grades 11-12 (A Level · IB · Class 11-12) · Curriculum: A Level 3.2.1
Periodicity test: the test questions
Question 1 Ionisation energy (2 marks)
- Define the first ionisation energy. (1 mark)
- Write the equation for the first ionisation of sodium, with state symbols. (1 mark)
Question 2 Shrinking atoms (3 marks)
Explain why the atomic radius decreases from sodium to chlorine.Question 3 Sulfur and phosphorus (3 marks)
The first ionisation energy of sulfur (1000 kJ/mol) is lower than that of phosphorus (1012 kJ/mol). Explain this.Question 4 Kelvin gap (2 marks)
Sodium melts at 98 °C and magnesium at 650 °C. Convert both to kelvin and calculate the difference.Question 5 Reading the melting point graph (3 marks)
- Name element D and state its structure. (1 mark)
- Explain why element E has a much lower melting point than D. (1 mark)
- Explain why element H has the lowest melting point. (1 mark)
Question 6 Percentage change in radius (2 marks)
The atomic radius of magnesium is 160 pm and of sulfur 104 pm. Calculate the percentage decrease from magnesium to sulfur.Question 7 Magnesium and aluminium (3 marks)
Explain why aluminium has a lower first ionisation energy than magnesium.Question 8 Chlorine and sulfur (2 marks)
Explain why S₈ has a higher melting point than Cl₂.
