Across
- 6. one twelfth the mass of a carbon-12 atom
- 7. a row in a periodic table of elements Group a column of elements in a periodic table
- 8. the pattern of repeating properties displayed by elements in the periodic table
- 9. elements that are good conductors of heat and electric current
Down
- 1. an electron that is in the highest occupied energy level of an atom
- 2. the elements in group 1A of the periodic table, not including hydrogen Alkalineearthmetals the elements in group 2A of the periodic table
- 3. an arrangement of elements in columns, based on a set of properties that repeat from row to row
- 4. elements that form a bridge between elements on the left and right sides of the periodic table
- 5. elements that are poor conductors of heat and electric current. Metalloids elements with properties that fall between those of metals and nonmetals