Across
- 3. in chemistry, a horizontal row of elements in the periodic table
- 6. one of the elements of group 2 of the periodic table
- 7. one of the elements of group 17 of the periodic table
Down
- 1. law that states that the repeating chemical and physical properties of elements change periodically with the atomic number of the elements
- 2. one of the elements of group 18 of the periodic table
- 4. a vertical column of elements in the periodic table; elements in a group share chemical properties
- 5. describes something that occurs or repeats at regular intervals
- 6. one of the elements of group 1 of the periodic table