1. The atomic mass of the elements increases as you move left to right and top to bottom on the Per. Table Wo has greatest atomic mass, Bo the least Bo, Wo, J, L Noble gases are in group 18 They are noble gases Bo, Wo, J, L What did you learn ? Clue Alien Element

2. Horizontal rows in the periodic table are periods Q is in the same period as Wo Q, Wo Reactivity decreases as you move from left to right on the Per. Table They are the most reactive group X, By, Ch, Q What did you learn ? Clue Alien Element

3. Horizontal rows in the periodic table are periods V is in the same period as Q and Wo V, Q, Wo -Atoms can gain or lose electrons -The # of electrons an atom will gain, lose or share is determined by the group that it is in Non-metals who typically gain or share one electron A, V, Kt What did you learn ? Clue Alien Element

4. The number of protons is equal to the atomic # T has more protons than Hi T Metalloids are located between the metals and the non-metals along the zigzag line. They are metalloids E, Hi, T, Ss What did you learn ? Clue Alien Element

5. Table salt is made of NaCl Kt and By make table salt Kt and By The atomic mass (lightness or heaviness) increases as you move left to right and down the periodic table Pf is the lightest element, El is the heaviest Pf, El What did you learn ? Clue Alien Element

6. Carbon is important in the chemistry of life Fx is important in the chemistry of life Fx The number of protons is equal to the atomic number on the periodic table D has 4 protons D What did you learn ? Clue Alien Element

7. As you move across the periodic table from left to right, the number of electrons increases in each period G has less electrons than M M, G, Ss The groups are numbered as you go from left to right across the periodic table M, G, Ss are in group 15 M, G, Ss What did you learn ? Clue Alien Element

8. Diatomic = 2 atoms hanging out together. Oxygen hangs our as O 2 It’s a diatomic molecule Nu Elements on the right side of the periodic table gain electrons (except for the noble gases) They all gain 2 electrons Up, Oz, Nu What did you learn ? Clue Alien Element

9. As you move down the periodic table, the atomic number increases Oz has a lower atomic number than Up The further to the right you move on the periodic table, the less reactive the element is R is less reactive than Do R, Do What did you learn ? Clue Alien Element Up, Oz

10. Atoms on the left side of the periodic table tend to lose electrons They lose 2 electrons Z, Pi What did you learn ? Clue Alien Element Z, Pi Z has fewer protons than Pi As you move down the periodic table, the atomic number increases

11. What did you learn ? Clue Alien Element An An has 49 electrons The number of electrons = the atomic number Z Z is used in flash bulbs Mg is used in flashbulbs

12. Answer Key