2. Twenty Questions

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4. 1. Moving from left to right across a row of the periodic table, which of the values increases by one from element to element? Atomic number

5. 2. What are most metals at room temperature? Solids

6. 3. True or False: Most metals are brittle. False

7. 4. What class do the tin, copper and cesium fall under (metals, nonmetals or metalloids)? Metals

8. 5.Who developed the periodic chart? Dmitri Mendeleev

9. 6. As you move from left to right across a period, what happens to the number of valence electrons? Increases

10. 7. How many valence electrons does Boron have? three

11. 8. How many valence electrons does nitrogen have? five

12. 9. What is the only metal that is liquid at room temperature? mercury

13. 10. What family of elements have a complete valance energy shell? Noble Gases

14. 11. What family of elements has one valance electron? Alkali metals

15. 12. True or False: Nonmetals tend to gain electrons to form cations? False: anions

16. 13. Which element has a similar property to Nitrogen? Carbon, Oxygen or Phosphorus Phosphorus

17. 14. What is the most inactive group of elements? Noble gases

18. 15. How can an element become stable? By gaining or losing electrons to fill the energy level

19. 16. Which of the elements are a metalloid? Antimony, carbon, tin Antimony

20. 17. What do the numbers at the top of each group represent? (ex: 1A, 2A) The number of valence electrons

21. 18. What class of elements is a good semi-conductor ? Metalloid

22. 19. Elements F and I have the same number of what? Valance electrons

23. 20. Give the atomic #, # of valence electrons, family and period # for Be. Atomic # 4 2 valence electrons Alkaline Earth Metals 2 period #