Which formula represents a mixture

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer

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