What does the atomic number mean or represent? also how do i make someone brainliest

The atomic number refers to the number of protons in the nucleus of an atom. The identity of an element is determined by its number of protons. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.

And if you want to mark someone's answer as brainliest first you have to get more than 1 answer to your question and then there will be a message above that says “Mark as brainiest”

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

it's filtration, but this is an assumption so my apologies if i got this