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[Music] in this video we are going to learn how to write a chemical formula first we will use the symbols of the elements and the symbols as we can find them here in the periodic table h is for hydrogen and li for lithium this periodic table gives us the symbols so to write a chemical formula were going to use the symbols not the words and then the second step is that were going to find the oxidation numbers and what is meant by an oxidation number of an element for example lithium here lithium it is li it has three uh protons so its atomic number is three which means it has three electrons these three electrons are theyre going to be arranged around the atom in the first shell too and the second shell is going to be the last electron and one valence electron so every atom has to needs to have eight electrons but this atom has only one so it can gain seven electrons to have eight electrons and to be stable or it can lose only one electron so which is easier to to gain or to lose uh
