Question
George made a table of some of the elements and the charges of their ions from period 4.
Element | Charge
K | +2
Ca | +2
Cr | +2 or +3
Se | -2
Br | -1
Using the Periodic Table, what mistake did George make in his table?
Element | Charge
K | +2
Ca | +2
Cr | +2 or +3
Se | -2
Br | -1
Using the Periodic Table, what mistake did George make in his table?
Answers
GPT-4o mini
George made a mistake in the charge assigned to potassium (K) and calcium (Ca).
1. **Potassium (K)** typically forms a +1 ion, not +2. Potassium is an alkali metal in group 1, and alkali metals generally form +1 ions by losing one electron.
2. **Calcium (Ca)** correctly has a +2 charge, as it is an alkaline earth metal in group 2 and typically forms +2 ions.
3. **Chromium (Cr)** can indeed form +2 and +3 ions, so that part is correct.
4. **Selenium (Se)** typically forms a -2 charge, which is also correct.
5. **Bromine (Br)** usually forms a -1 charge, which is correct as well.
In summary, the main mistake in George's table is the charge for potassium (K), which should be +1 instead of +2.
1. **Potassium (K)** typically forms a +1 ion, not +2. Potassium is an alkali metal in group 1, and alkali metals generally form +1 ions by losing one electron.
2. **Calcium (Ca)** correctly has a +2 charge, as it is an alkaline earth metal in group 2 and typically forms +2 ions.
3. **Chromium (Cr)** can indeed form +2 and +3 ions, so that part is correct.
4. **Selenium (Se)** typically forms a -2 charge, which is also correct.
5. **Bromine (Br)** usually forms a -1 charge, which is correct as well.
In summary, the main mistake in George's table is the charge for potassium (K), which should be +1 instead of +2.