Zadanie 5a
Wzorowane na: Chemistry HL Paper 2, May 2022, TZ2, pytanie 5(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 5a-5c.
Cattierite is a mineral that consists mainly of cobalt(II) disulfide, CoS2.
Polecenie
(i) State the full electron configuration of Co2+.
(ii) Explain why there is a large increase from the 9th to the 10th ionization energy of cobalt.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) 1s2 2s2 2p6 3s2 3p6 3d7 ✔
(ii) any two of:
IE10: the electron is removed from a lower energy level / the 3p sublevel «below the 3d and 4s electrons» ✔
IE10: the electron is closer to the nucleus / more strongly attracted by the nucleus ✔
IE10: less shielding «by the remaining inner levels» ✔
Schemat punktowania
(i) [1]; the configuration must be written in full and must show no 4s electrons. (ii) [1] for each point, maximum [2]. Cobalt has nine electrons outside the argon core (3d7 4s2), so the 10th electron comes from the n = 3 level.