Periodic Table crossword

123456789101112131415161718
Across
  1. 2. Electron: Electrons in the outermost shell of an atom, responsible for chemical bonding and reactivity.
  2. 5. A one- or two-letter abbreviation for an element (e.g., H, Na, Fe).
  3. 6. Number The number of protons in the nucleus of an atom, which determines the element's position on the table.
  4. 7. Mass The weighted average mass of an atom of an element, typically measured in atomic mass units (amu).
  5. 11. Gas Elements in Group 18, characterized by being nonreactive (inert) due to a full valence shell.Halogen Highly reactive nonmetals in Group 17, often found in salts.
  6. 12. Negatively charged subatomic particles orbiting the nucleus in energy levels.
  7. 14. Elements that are shiny, malleable, ductile, and good conductors of heat/electricity (mostly left and center).
  8. 15. Metal Elements in groups 3-12, known for having filled or partially filled d-orbitals.
  9. 17. Energy The energy required to remove an electron from an atom.
  10. 18. Elements with properties intermediate between metals and nonmetals (located along the staircase line).
Down
  1. 1. Positively charged subatomic particle located in the nucleus.Neutron: Subatomic particle with no charge located in the nucleus.
  2. 3. The building blocks of the periodic table
  3. 4. A measure of an atom's ability to attract shared electrons in a chemical bond.
  4. 8. Atoms of the same element with the same number of protons but different numbers of neutrons.
  5. 9. A vertical column in the periodic table (1-18), where elements share similar valence electron configurations and chemical properties.
  6. 10. Metal Highly reactive metals in Group 1, having one valence electron.
  7. 13. A horizontal row in the periodic table (1-7), indicating the number of electron shells in an atom.
  8. 16. Elements that are poor conductors of heat/electricity, often gases or brittle solids (upper right).