Unit 2 Vocabulary

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Across
  1. 5. The sum of the protons and neutrons of an atom
  2. 6. A model that uses the chemical symbol of an element surrounded by dots indicating the number of valence electrons.
  3. 7. An element that is generally gaseous or a dull, brittle solid that is a poor conductor of heat and electricity
  4. 9. An electron in an atoms outermost energy level, involved in chemical bonding
  5. 11. A neutral subatomic particle found in the nucleus of an atom
  6. 14. States that properties of elements repeat with increasing atomic number
  7. 16. Atoms of the same element with a different number of neutrons
  8. 18. A notation of one or two letters representing a chemical element
  9. 20. Elements in the same column of the periodic table, having the same number of valence electrons
  10. 21. Groups of elements in the periodic table that are designated with a B
  11. 23. A positively charges subatomic particle located in the nucleus of an atom
  12. 26. The number of protons in an atom
Down
  1. 1. An element that has the physical appearance and properties of a metal but behaves chemically like a nonmetal
  2. 2. Group of elements in the periodic table that are designated with an A
  3. 3. The smallest particle of matter that represents a particular element
  4. 4. The arrangement of electrons in an atom.
  5. 8. Fixed distances from the nucleus of an atom where electrons may be found.
  6. 10. An element that is a solid at room temperature and a good conductor of heat and electricity
  7. 12. Elements in the same row of the periodic table, having the same number of energy levels
  8. 13. A measure of the ability of an atom to attract electrons
  9. 15. The extremely small, positively charged, dense center of an atom, made of protons and neutrons
  10. 17. A negatively charged subatomic particle outside the nucleus of an atom
  11. 19. One-half the distance between the nuclei of two atoms of the same element when the atoms are side by side.
  12. 22. An atom, or group of atoms, that have an electrical charge, due to the loss or gain of electrons
  13. 24. The weighted average mass of all the isotopes of that element
  14. 25. A group of elements on the periodic table that share common properties