1. Which of the following is true of a chemical reaction? a. Only physical changes occur.
b. New substances must form.
c. Only changes of state occur.
d. Chemical properties remain the same.

B.) new substances must form

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