Can some please help and not be those accounts that send a link that is some scam

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

What human activity increases beach erosion?