Answer:
Their charge is —1
Explanation:
Halogens form ionic compounds by receiving 1 electron from a metallic atom to obtain their octet configuration. This is clearly seen when sodium(Na) react with chlorine(Cl) to form sodium chloride (NaCl) as shown below:
Na —> Na+ + e-
Cl + e- —> Cl-
Combining both equation together, we have:
Na + Cl + e- —> Na+ + Cl- + e-
Eliminate the e-
Na + Cl —> Na+Cl-
From the ionic equation we can see that the charge of the Halogen (Cl) is —1
