A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2021 · 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
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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
C: The atomic radius of phosphorus is smaller than that of magnesium. phosphorus has greater nuclear charge than magnesium
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