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