Zadanie 1e
Wzorowane na: Chemistry SL Paper 3, May 2023, TZ1, pytanie 1(e). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 1a, 1c-1f.
The table gives the first ionization energy and the first electron affinity of the elements in period 3 of the periodic table.
| Element | First ionization energy / kJ mol−1 | First electron affinity / kJ mol−1 |
|---|---|---|
| Na | 496 | −53 |
| Mg | 738 | +40 |
| Al | 578 | −42 |
| Si | 787 | −134 |
| P | 1012 | −72 |
| S | 1000 | −200 |
| Cl | 1251 | −349 |
| Ar | 1520 | +96 |
Polecenie
Suggest reasons why argon has the largest first ionization energy and the largest positive first electron affinity of the elements in period 3.
Largest first ionization energy:
Largest positive first electron affinity:
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Largest first ionization energy:
the highest nuclear charge «of the period» acting on electrons in the same main energy level ✔
OR smallest atomic radius ✔
OR stable electron arrangement, so a lot of energy is needed to remove an electron ✔
Largest positive first electron affinity:
the added electron enters a new, higher main energy level (n = 4) ✔
OR the added electron is much further from the nucleus ✔
OR the added electron is shielded by the completed inner energy levels ✔
Schemat punktowania
M1: reason for the largest first ionization energy. M2: reason for the largest positive first electron affinity. Do not accept "complete octet" for M1 unless it is linked to stability or to the energy needed.