"Trends Across A Period":

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Across
  1. 7. Positively charged subatomic particle
  2. 8. They are the electrons in the outermost electron shell insulated atom of an element
  3. 10. across a period first increases and then decreases
  4. 12. How likely or vigorously an atom is to react with other substances
  5. 15. Chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure
  6. 16. They are mostly gases and sometimes liquid
  7. 17. The distance from the atom's nucleus to the outer edge of the electron cloud
  8. 19. The level of reactivity of a metal
  9. 20. An elements that does not react
  10. 22. The alkaline metals in Periodic Table
  11. 23. Atom's ability to attract electrons
  12. 24. The energy required to change the state of an element from its solid state to its liquid state
Down
  1. 1. Ability of an atom to accept an electron
  2. 2. They are best considered not as a vertical group of elements but as a row or block
  3. 3. The positively charged center of the atom consisting of protons and neutron
  4. 4. The alkali metals in Periodic Table
  5. 5. Elements found in Group 1 of the periodic table
  6. 6. Temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor
  7. 9. The number of protons in the nucleus
  8. 11. Elements on the RIGHT SIDE of the periodic table have a HIGHER ionization energy
  9. 13. Negatively charged subatomic particle
  10. 14. Typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
  11. 18. an atom
  12. 21. The elements in group 18 on the periodic table