page 160 (#’s 1–7) 1. 2. 3. 4. 5. 6. 7. They used the properties of elements to put each one into groups. He organized the elements by the order of increasing atomic mass. They are arranged by increasing atomic number The three classes are metals, nonmetals, and metalloids. B, because they all belong to the earth metal groups Gold=metal, silicon=metalloid, sulfur=nonmetal, barium=metal Potassium and lithium 167 (#’s 8–9) 8. 9. Carbon= 1s^2 2s^2 2p^2, strontium= 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 5s^2…
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