Question

Write the following metals using Roman numeral notation. Then, explain why the Roman numeral differs for these metals.

Cu^1+

CoCl_2

Answer 1

Step-by-step explanation:

The "Roman numeral notation" uses symbols to indicate how large the positive charge of the metal ion is.

In particular:

A charge of 1+ is labeled with a capital (I),

2+ is labeled with a capital (II),

3+ is labeled with a capital (III),

4+ is (IV)

5+ is (V)

6+ is (VI)

7+ is (VII)

So, in our question, we have Cu^1+. The element symbol "Cu" is copper, and we have a 1+ charge. The Roman numeral notation is: Copper (I)

For the second part, we have CoCl2. The metal here is Co. The element symbol "Co" is cobalt. What is the charge? We should know that Cl has a negative charge of 1-, so since we have two Cl atoms, the overall negative charge is 2-. Since the substance is neutral, this means that the cobalt atom must have a positive charge of 2+ to balance. So, the Roman numeral notation is: Cobalt (II)