atoms unit 1 vocabulary crossword puzzle

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Across
  1. 4. Mass: Weighted average mass of isotopes, expressed in atomic mass units (AMU).
  2. 5. Negatively charged subatomic particle orbiting the nucleus.
  3. 7. Lacks metallic properties (e.g., oxygen, nitrogen).
  4. 10. State: Lowest energy state of an atom.
  5. 11. Table: Arrangement of elements by atomic number.
  6. 13. State: Temporary, higher-energy electron state.
  7. 17. Charged particles from electron gain/loss.
  8. 18. Number: Proton count uniquely identifying elements.
  9. 20. Atom’s central core containing protons and neutrons.
  10. 21. Diagram: Visual representation of valence electrons using dots around an element’s symbol
  11. 22. Basic building block of matter, composed of protons, neutrons, and electrons. Forms molecules and cannot be further divided by ordinary chemical processes.
  12. 25. Lines: Wavelengths emitted/absorbed during electron transitions.
  13. 27. Model: Early atomic model with specific electron energy levels.
  14. 28. Elements with properties between metals and nonmetals.
  15. 29. Uncharged particle in atomic nuclei, crucial for nucleus stability.
  16. 30. Energy Levels: Different energy levels within an electron shell.
Down
  1. 1. Model: Describes electrons as waves, improving atom behavior understanding.
  2. 2. Electrons: Outermost energy level electrons.
  3. 3. Shell: Outermost electron shell determining chemical properties.
  4. 6. Symbol: Abbreviation for an element (e.g., H for hydrogen).
  5. 8. Structure: Diagram showing electron arrangement in atoms/molecules.
  6. 9. Positively charged particle in an atom’s nucleus, nearly equal in mass to a neutron.
  7. 12. Region around the nucleus where electrons are likely found.
  8. 14. Energy Levels: Specific shells around the nucleus.
  9. 15. Same element, different neutron count.
  10. 16. Unit for atomic and molecular weights, approximately proton/neutron mass.
  11. 19. A fundamental particle that makes up protons and neutrons.
  12. 23. Number: Total protons and neutrons in an atom’s nucleus.
  13. 24. Foil Experiment: Ernest Rutherford’s groundbreaking 1909 experiment bombarding gold foil with alpha particles, revealing the atomic nucleus and disproving J.J. Thomson’s model.
  14. 26. Model: Describes atoms with a dense, positively charged nucleus (protons and neutrons) orbited by negatively charged electrons.