2 stands for valency of ca ion
its +2
that it takes two electrons to complete its shell
Answer:
Explanation:
Rivers may be contaminated by sewage.
I do hope I helped you! :)
The answer would be C. In fact, letter A already defines the Law of Definite Proportions. On the other hand, J.J. Thomson was responsible for the discovery of electrons through cathode ray tube experiments. The rest of the choices are true.
A cellphone battery is a electrical energy
and a piston in an engine is an thermal energy
