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Unit 6 Review – Periodic Table and Trends 1. Fill in the blanks with increases or decreases. 1. As you move across a period, atomic radius ________________________________ 2. As you move down a group, atomic radius _______________________________ 3. As you move across a period from group 1 to 14 reactivity ________________________________ 4. As you move across a period from group 14 to 17 reactivity ________________________________ 5. As you move down a group, reactivity _______________________________ 6. As you move across a period, ionization energy _______________________________ 7. As you move down a group, ionization energy _______________________________ 8. As you move across a period, electronegativity _______________________________ 9. As you move down a group, electronegativity _______________________________ 2. Which gives the correct order from smallest radius to largest radius (can be more than one answer)? a. Ne, O, C, Be c. K, Se, Br, Kr b. C, Si, Ge, Sn d. He, Ne, Ar, Kr 3. A positive ion (cation), like K+1 has a _larger/smaller_ radius than the neutral atom of potassium. 4. A negative ion (anion), like Br-1 has a _larger/smaller_ radius than the neutral atom of bromine. 5. Circle the ion in each pair that has the largest ionic radius. a) Al Al+3 b) S S-2 c) Br Br -1 d) Na Na+1 6. Define reactivity 7. Circle the atom in each pair that has the greater reactivity? a) Li Be b) Na K c) Cl Si d) Ca Ba e) P Ar f) Li K 8. Define ionization energy 9. Circle the atom in each pair that has the greater ionization energy. a) Li Be b) Na K c) Cl Si d) Ca Ba e) P Ar f) Li K 10. Define electronegativity 11. Circle the atom in each pair that has the greater electronegativity. a) Ca Ga b) Li O c) Cl S d) Br As e) Ba Sr f) O S 12. Are elements more or less metallic as you move across a period in the periodic table? 13. What are the common properties of metals? 14. Which elements would be classified as ‘semi-conductors’ (metals/metalloids/nonmetals)? Where are they located on the periodic table? List these elements. 15. Which is the only metal that is a liquid at room temperature? ___________________________ 16. Which element would be ‘ductile’? a. carbon b. gold c. chlorine d. xenon 17. Which element has the highest density? _______ lowest density? _______ a. osmium b. chlorine c. bromine d. xenon 18. Which element is in period 4, group 9? _______ 19. Which elements are in the halogen family? ____________________________________________ 20. Which group/family consists of soft, reactive metals with two valence electrons? ____________________ 21. Which family is composed of elements that are gases and unreactive? _____________________________ 22. Which family of elements includes soft, reactive metals that form an ion with a +1 charge?____________ 23. Which family of elements includes inert (nonreactive) gases that glow when energized with electricity? _____________________________________________________ 24. The first periodic table was published by ______________________ in _______________. 25. Dimitri Mendeleev’s periodic table was arranged according to increasing ____________ ____________. 26. Why did the Mendeleev periodic table help increase the discovery of new elements? 27. Henry Moseley’s periodic table was arranged according to increasing ____________ ______________. 28. How many electrons are needed in an atom’s outermost energy level (valence shell) to make it stable? __. Use complete sentences to answer the following. 1. Why does atomic radius increase as you go down in a group? 2. Why does atomic radius decrease as you go across a period? 3. Explain why fluorine is the most electronegative element on the periodic table, using valence electrons and atomic radius in your explanation.