Review your earlier answer about how you think melted rock deep within Earth could change over
time. Would you revise your answer now? If so,
how? If not, explain why.

D. most models represent a real world object in a simpler way

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