Across
- 2. Measure of an atom's ability to attract electrons in a chemical bond.
- 4. Energy required to remove an electron from an atom.
- 7. Series of elements in the periodic table with atomic numbers from 89 to 103.
- 8. Number of electrons in the outermost shell of an atom.
- 13. The repeating pattern of properties in the periodic table.
- 18. Number of protons in the nucleus of an atom.
- 19. Group of elements with partially filled d orbitals.
- 20. Group 17 elements known for their high reactivity.
Down
- 1. Series of elements in the periodic table with atomic numbers from 57 to 71.
- 3. To forecast the properties of undiscovered elements based on their position in the periodic table.
- 5. Russian chemist who developed the periodic table.
- 6. Element with properties intermediate between metals and nonmetals.
- 9. Organization of elements based on similar properties.
- 10. Group 1 element with a single valence electron.
- 11. Substance consisting of atoms with the same number of protons.
- 12. Group of elements with full outer electron shells, making them unreactive.
- 14. Principle stating that the properties of elements vary periodically with their atomic numbers.
- 15. Horizontal row in the periodic table.
- 16. Weighted average of the masses of an element's isotopes.
- 17. Vertical column in the periodic table.