Who developed the periodic table based on atomic number?
Dimitri Ivanovich Mendeleev (sp?) (born in siberia about 1830 give or take: A russian chemist.) first invented the periodic table based on ATOMIC MASS. He was NOT the first to develope the periodic table based on atomic number. A british physicist named Henry Moseley (was young and didn’t live very long 1887 to 1915, I think) developed the first periodic table based on ATOMIC NUMBER. Unlike the other posts suggest, Mendeleev’s periodic table could not have been based on atomic number, since the concept of atomic number was invented by Moseley, and he wasn’t even born yet. It is a common mistake, however. So based on atomic MASS= Mendeleev based on atomic NUMBER= Moseley For the last question, you want the formula? Potassium Nitride: K3N Potassium Nitrate: KNO3 Potassium Nitrite: KNO2 (I always got them mixed up too, the -ides, -ates, and -ites.
