What is the atomic number , mass number and amount of protons electrons and nuetrons for the following symbols? li+ mg²+ o²- 12pts for best answer asap thx

Lithium (Li)
Atomic Number: 3
Atomic Mass: 6.941 amu
3 protons, 3 electrons, 4 neutrons

Magnesium (Mg)
Atomic Number: 12
Atomic Mass: 24.305 amu
12 protons, 12 electrons, 12 neutrons

Oxygen (O)
Atomic Number: 8
Atomic Mass: 15.9994 amu
8 protons, 8 electrons, 8 neutrons

Hope this helps!

4,000 mL of H2O