Cobalt ions may have charges of 2+2+2+, 3+3+3+, 4+4+4+ or 5+5+5+. In a cobalt chloride crystal, there are two chloride ions for every cobalt ion. Each chloride ion has a charge of 1−1-1−. What is the charge on the cobalt ion in this compound?
3+3+3+
5+5+5+
2+2+2+
4+4+4+
91 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.