A-LevelChemistryChemical periodicityFeb/Mar 2021Paper 1 Q131 Mark
Which row is correct? statement reason A The first ionisation energy of phosphorus is greater than that of magnesium. electron is lost from a 3p orbital in both cases B The melting point of phosphorus is greater than that of magnesium. phosphorus has more valence electrons than magnesium C The atomic radius of phosphorus is smaller than that of magnesium. phosphorus has greater nuclear charge than magnesium D The electrical conductivity of phosphorus is smaller than that of magnesium. bonding changes from ionic in magnesium to covalent in phosphorus
AThe first ionisation energy of phosphorus is greater than that of magnesium. electron is lost from a 3p orbital in both cases
BThe melting point of phosphorus is greater than that of magnesium. phosphorus has more valence electrons than magnesium
CThe atomic radius of phosphorus is smaller than that of magnesium. phosphorus has greater nuclear charge than magnesium
DThe electrical conductivity of phosphorus is smaller than that of magnesium. bonding changes from ionic in magnesium to covalent in phosphorus
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of chemical periodicity within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep