Periodic Table of Elements

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Across
  1. 4. A pure substance composed of the same type of atom throughout
  2. 6. The number of protons in the nucleus of one atom of an element
  3. 7. The mass of an atom, approximately equal to the number of protons and neutrons in the atom
  4. 10. Elements that are typically not shiny, not malleable, and poor conductors of hear and electricity; usually gases or brittle solids
  5. 11. Elements that are typically solid, shiny, malleable, and good conductors of hear and electricity; includes most elements
  6. 13. Nonreactive nonmetals in Group 18 of the periodic table
Down
  1. 1. The electrons in the outermost energy level of an atom that influence how an element will react with other substances
  2. 2. a one-or two -letter notation used to represent an atoms of a particular element
  3. 3. The columns on a periodic table that arrange the elements by the number of electrons that are in the outermost shell; also called families
  4. 5. A table in which all the known elements are arranged by properties and are represented by symbols
  5. 8. Elements that have properties of both metals and nonmetals; sometimes referred to as semiconductors
  6. 9. The rows in a periodic table that classify the elements by the number of electron shells
  7. 12. The area surrounding the nucleus of an atom where the electrons are found