Chlorine is a non-metal in group 7. This tells us that it will produce ions that have a charge of __________. Which of the following completes the sentence?

The sentence can be completed as follows: "Chlorine is a non-metal in group 7. This tells us that it will produce ions that have a charge of -1."

Here's why:

1. Chlorine is in Group 7 of the periodic table.

2. Elements in Group 7 are known as halogens.

3. Halogens have seven valence electrons. Valence electrons are the electrons in the outermost shell of an atom and are involved in forming bonds with other atoms.

4. Atoms are most stable when their outermost shell is full. For most atoms, this means having eight electrons in their outermost shell.

5. To achieve this, chlorine will gain one electron from another atom when forming a bond.

6. When an atom gains or loses electrons, it forms an ion. An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

7. Since chlorine gains one electron, it forms an ion with a charge of -1. The negative sign indicates that the ion has more electrons than protons.