All of the above . ......
For the atom to be neutral, it must have the same number of electrons and protons. The aromic number indicates the number of protons. Since Carbon has 6 protons, it would have to have 6 electrons for it to be neutral
The most common isotope of hydrogen is H¹ and this isotope has 0 neutrons
D will because water just turns from liquid to a gas by adding heat. That is a physical change. The other equations are chemical changes.
