Zadanie 12
Wzorowane na: Chemistry SL Paper 1A, May 2026, TZ2, pytanie 12. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Why is the first ionization energy of potassium lower than that of sodium?
A. Potassium has fewer protons in its nucleus than sodium
B. The outer electron of potassium is in a higher main energy level, further from the nucleus and more shielded
C. Potassium has more electrons in its outer energy level than sodium
D. The outer electron of potassium experiences a much greater effective nuclear charge
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
B ✔
«the outer electron of potassium is in the fourth main energy level, compared with the third in sodium; it is further from the nucleus and shielded by more inner electrons, so it is held less strongly and less energy is needed to remove it»
Schemat punktowania
One mark for the correct option; no partial credit.