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in this lesson were going to talk about how to write the chemical formulas of ionic compounds now before you do so you need to know the charges of certain ions so lets focus on the elements in group one like lithium sodium potassium these elements they have one valence electron and so they tend to form plus one charges or cations with positive one charges now in the second column you have the group two elements the alkaline earth metals and these include elements such as calcium magnesium and so forth these elements they form ions with a two plus charge now in the middle you have transition elements which can have variable charges so were not going to focus on those too much but moving on to group 13 also known as group 3a you have elements such as aluminum im going to write it over here and this element has a 3 plus charge and then you have elements like carbon silicon germanium which are found in group 4a and for ionic compounds its rare that youll see those elements in group
