Periodic Table Crossword

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Across
  1. 2. negatively charged particle that orbits the center of an atom
  2. 3. elements and/or compounds that when put together are unable to react chemically. The noble gases (group 18) elements are inert because of a full valence shell.
  3. 4. an element that has some properties of a metal and some properties of a nonmetal. The metalloids are found on the boron staircase
  4. 6. positively charged particle in the nucleus of the atom
  5. 10. an atom that has gained or lost one or more electrons.
  6. 14. Group 1 metals on the periodic table that contain 1 valence electron and lose their valence electrons the most easily, making them the most reactive metals.
  7. 16. ­Group 1 metals on the periodic table that contain 2 valence electrons and are the second most reactive metals.
  8. 17. very center of the atom
  9. 18. Group 18 elements on the periodic table that contain 8 valence electrons
  10. 20. a vertical column (up and down) on the periodic table
Down
  1. 1. electrons that are located in the outermost energy level of an atom
  2. 5. Group 17 nonmetals on the periodic table that contain 7 valence electrons.
  3. 7. describes how likely an element is to form bonds with other elements.
  4. 8. an element that does not conduct electricity or heat and is usually a gas at room temperature. Nonmetals are brittle, have high ionization energies and high electronegativity values. Nonmetals tend to gain electrons to form anions. Nonmetals are found on the right side of the boron staircase.
  5. 9. the number of protons contained in each nucleus of its atoms of the element. Located over the elemental symbol (at the top of the element box on the periodic table).
  6. 11. the number of protons and neutrons in the nucleus of one atom of the element. Located under the elemental symbol (at the bottom of the element box on the periodic table).
  7. 12. an element or substance that conducts heat and electricity, is malleable and ductile and has low ionization energy and low electronegativity values. Metals tend to lose their electrons to form cations. Metals are found on the left side of the boron staircase.
  8. 13. a substance that cannot be broken down into a simpler substance by ordinary chemical means.
  9. 15. a horizontal row (left to right) in the periodic table.
  10. 19. the smallest unit of an element that has all of the properties of the element; basic building block of matter.