Other examples of ionic bonding
3 marks · Easy| Element | Group number | Atomic number | Ion formed | Number of electrons in ion |
|---|---|---|---|---|
| Calcium | 2 | 20 | Ca2+ | |
| Chlorine | 7 | 17 | Cl– | |
| Aluminium | 3 | 13 | Al3+ |
(a)[3 marks]
Complete the table by giving the number of electrons in each ion.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Must show: Calcium ion: 18 electrons, Chloride ion: 18 electrons, Aluminium ion: 10 electrons
Common mistakes: Incorrectly adds or subtracts electrons for each ion
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Calcium ion (Ca2+) has 18 electrons
B1 · 1 mark · Chloride ion (Cl–) has 18 electrons
B1 · 1 mark · Aluminium ion (Al3+) has 10 electrons
Worked solution
| Element | Group number | Atomic number | Ion formed | Number of electrons in ion |
|---|---|---|---|---|
| Calcium | 2 | 20 | Ca2+ | 18 |
| Chlorine | 7 | 17 | Cl– | 18 |
| Aluminium | 3 | 13 | Al3+ | 10 |