pH numbers up to 6 are acids and 8-14 are alkaline. 1 is the strongest acid, 6 being the weakest acid, and 14 is a strong alkaline and 8 is a weakest alkaline.
Atomic number shows the number of protons in an atom's nucleus. If the atomic number is 30, then it has 30 protons. The question says it is neutral, so it must have the same amount of protons and electrons.
