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in this video were going to focus on writing formulas for ionic compounds at first were going to go over a few basic examples then well cover examples that contain polyatomic ions and even transition metals so before we begin we need to know the charges of common ions elements in the first column of the periodic table like hydrogen sodium potassium rubidium even lithium these metals they form positive one charges when they become ions elements in the second column like magnesium calcium these ions typically form plus two charges and then to the right you have group three elements like aluminum in group 3a these elements form positive 3 charges next to aluminum you have elements such as carbon silicon germanium we dont have to worry about the charges for these elements because it can vary and typically you wont see them very often in ionic compounds by themselves at least now the next group you need to know thats nitrogen phosphorus these typically form negative three cha