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what is the bottom number of an element in the periodic table called and what does it mean
atomic number and it says how many protons is in that element
what is the top number mean in a element and what is it called
its called mass number and its the total of protons and neutrons there are in a element
who was dmitri mendeleev
dmitri mendeelev in the mid 19th century he divided the periodic table and organised all elements