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LMGHSName:____________________________ Band:__________________________Periodic table worksheet # 21. The periodic table is defined as________________________________________________________________________________________________________________________________________________________________________________________________________________________2. ___________________are substances that cannot be broken down into simpler stuff by any chemical means.3. Dmitri Mendeleev was a _________________ scientist who set up the periodic table in the _________________ century.4. Using Mendeleev’s system elements with similar________________ and ______________________ properties fell into families or groups.5. How do we name the vertical columns in the periodic table?______________________6. Elements on the periodic table are usually identified with three things.What are they?______________________________________________________________________________7. Protons are found in the __________________ of an atom.8. Metals are found on the __________________ side of the table, while the nonmetals are found on the ___________________ side of the table.9. An element that is an alkali metal is ___________________.10. Helium (He) is a ____________________.11. There are two rows of elements on the bottom of the table. These elements are the rare earth metals. What is the name given to each of these rows of elements?______________________________________12. Name two elements in group 17.13. What is the symbol for the following elements?Magnesium _____________b. Potassium ______________c. Iron _______________d. Copper ___________14. Give an example with the following characteristics.a. Halogen _________________b. Nonmetal ________________c. Alkali metal ______________d. metalloid ________________e. Lanthanide series __________f. Alkaline Earth metal ________________g. Transition metal ___________h. Nobel gas ________________15. Write the electron configuration for Li _______________________________________________________________Na ______________________________________________________________K _______________________________________________________________16. How many valence electrons are in the following element? a. F ________b. Cl ___________c. Br ____________d. I _____________e. O ________f. S ___________g. Se ____________h. Te ____________Answers to the worksheet1. The periodic table is defined as an organization of the elements in orderof increasing atomic number and grouped according to similar chemicalproperties and similar electron arrangements.2. Elements are substances that cannot be broken down into simpler stuff byany chemical means.3. Dmitri Mendeleev was a Russian scientist who set up the periodic table inthe nineteenth century.4. Using Mendeleev’s system elements with similar physical and chemicalproperties fell into families or groups.5. Families or groups are designated by what? Vertical columns6. Elements on the periodic table are usually identified with three things.What are they?SymbolAtomic numberAtomic weight7. Protons are found in the nucleus of an atom.8. Metals are found ................
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