If an ion has 26 protons and 24
electrons, what is the charge on the
ion?

+2

Explanation:

Proton number = Electron number = Atomic number

(Provided the element is in unreacted state)

But, proton number = 26

And electron number = 24

This means the element has lost two (2) electrons thereby making it a positively charged ion.

So, the ion is +2

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

1.solid

2.carbon dioxide

3.helium