Prompt Read Changes on Earth and Changes in Lite. Explain how changes in Earth's systems affect the growth of life on Earth. Use
evidence from the text to support your answer.

They are all full and don't need any more electrons in there outer shell.

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

Ithink that the answer is b