Across
- 1. a vertical column of elements in the periodic table arranged in order of increasing atomic number; also called a family
- 5. a measure of the tendency of an atom to accept an electron
- 7. a highly reactive group 17 element
- 8. in the periodic table, the f-block elements from period 7 that follow the element actinide
- 10. the SI unit for frequency (one cycle per second)
Down
- 2. a horizontal row of elements in the modern periodic table
- 3. an element that has physical an chemical properties of both metals and nonmetals
- 4. the lowest allowable energy state of an atom
- 6. an elevation in energy level above an arbitrary baseline
- 9. an extremely unreactive group 18 element