1) what are similarities between our periodic and Mendeleev a) metals and non metals are separated b) all of them were found by two scientists c) they were all arranged by the atomic number 2) what group is Lilthuim a) alkali metals b) transition metals c) noble gases 3) what is isotopes a) same atomic number but different mass number b) they are all equal 4) how do you work the number of neutrons   a) you minus the mass number and atomic number b) you add the protons and electrons

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