4. An atom has 23 protons, 27 neutrons, and 23 electrons, a second atom has 23 protons, 28 neutrons, and 23 electrons, and a third atom has 23 protons, 27 neutrons, and 18 electrons. a. What is the name and symbol of the element? b. What is the atomic mass number of each atom? c. What is the charge on each atom? d. Write the symbol ( ) for each atom