For isoelectronic ions, how are effective nuclear charge and ionic radius related? a) as nuclear charge (z) increases, ionic radius increases. b) as nuclear charge (z) increases, ionic radius decreases.

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