Zadanie 5
Wzorowane na: Chemistry HL Paper 1, May 2023, TZ1, pytanie 5. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Polecenie
Which statement best explains why the first ionization energy of aluminium is lower than that of magnesium?
A. Aluminium has more protons than magnesium
B. Aluminium has a smaller atomic radius than magnesium
C. The outer electron of aluminium is in a 3p sub-level, which is higher in energy than the 3s sub-level of magnesium
D. Aluminium has an additional inner energy level compared with magnesium
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
C ✔
«magnesium is [Ne] 3s2 and aluminium is [Ne] 3s2 3p1; the 3p electron is higher in energy and is shielded by the 3s electrons, so it is removed more easily despite the larger nuclear charge. More protons and a smaller radius would increase the ionization energy»
Schemat punktowania
One mark for the correct option.