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1)what do the numbers on Mendeleev's periodic tablerepresent?
2) why was Mendeleev's decision to leave blank spaces on histable sometimes was referred to as his most significantcontribution to the periodic table?
3) state the periodic law. How does this law differ fromMendeleev's arrangement of the periodic table?
6. The periodic table is a result of the periodic law. What observa- tions led to the periodic law? What theory explains the underly- ing reasons for the periodic law?
Find the atomic mass of copper and lead from the periodic table.