Aquated ammonium ions (NH4+) are weakly acidic, with Ka= 5.5 x 10^(-10) at 25 degrees Celsius. NH4+ (aq) + H2O (l) <---> NH3 (aq) + H3O+ (aq)
What is the pH of a 1.00 mol/L solution of ammonium nitrate (NH4NO3)?

Yes it would be a physical change.

U whay do you need with?

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom