Is rainwater a strong weak or nonelectrolyte?

Rainwater is fairly pure however it can also pick up some particulate matter and electrolytes from the air, although not much. It will be saturated with atmospheric CO2, so with a little buffering capacity, it will be at a pH of about 5.5, which is also the pH of carbonic acid, a weak acid. Hence rainwater is a weak acid.

indium, and thallium have three electrons i think