According to the theory of matter proposed by john dalton:

1. all matter is made up of atoms
2. all atoms of the same element have the same mass
3. all atoms of the same element have the same size
4. combinations of atoms create chemical change

Tropical easterlies is mostly likely your answer correct me if i’m wrong

Exothermic,  physical change after it is already baked

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