Write the ground state or noble gas electron configuration for the following elements and determine the number of valance electrons for each: 1) Calcium

2) Iron

3) Bromine

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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

The answer is bhope this