A student was roasting marshmallows over a fire. The student noticed that the marshmallows turned brown, and they were
bubbling. Is this a chemical or physical change to matter? How do
you know? List two signs that you know what type of change it is.

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

You would do 1500/4 and the answer is 375