What are the properties of elements related to? a) the number of electrons that fill the outer shell b) an element's symbol c) the total number of electrons d) the average atomic mass

The correct answer is A) the number of electrons that fill the outer shell.

Brady

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