The Periodic Table and Periodic Law

6. How many periods are on the table? _____ 7. Columns of the periodic table are called _____. Part 4: Periodic Table Groups. Write. the numbers (1-18) above the . columns. of the periodic table. Part 5: Valence Numbers. Write the numbers (1-20) in the . squares. for the first twenty elements. Write the numbers (1-18) above the columns of the ... ................
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