Periodic Table Vocab

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Across
  1. 5. The number of electrons with which a given atom generally bonds or number of bonds an atom forms
  2. 7. Un-reactive non-metals in Group 18 of the Periodic Table
  3. 8. A one- or two-letter notation used to represent an atom of a particular element
  4. 9. Most elements are metals, typically solid, shiny, malleable, and a good conductor of heat and electricity
  5. 10. The very dense region consisting of protons and neutrons at the center of an atom
  6. 11. The physical and chemical characteristics of a substance or element
  7. 12. Metals found in Group 1 of the Periodic Table; compared to other metals they are soft and have low melting points and densities
  8. 14. A specific area where electrons of the same energy level are found
  9. 19. A grouping of electrons surrounding the nucleus of an atom
  10. 21. The columns on a periodic table that arranges the elements by the number of electrons that are in the outside shell
Down
  1. 1. The number of protons in the nucleus of one atom of an element
  2. 2. The rate at which a chemical substance tends to undergo a chemical reaction
  3. 3. A table showing the chemical elements arranged according to their atomic numbers
  4. 4. The rows in a periodic table that classifies the elements by the number of atomic shells
  5. 6. The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons
  6. 12. The smallest unit of an element that has all of the properties of that element containing a nucleus within an electron cloud
  7. 13. Elements that have properties of both metals and non-metals; sometimes referred to as semiconductors
  8. 15. The average mass of protons and neutrons in an element
  9. 16. Elements typically not shiny, usually a gas or brittle solid, not malleable, and a poor conductor of heat and electricity
  10. 17. A pure substance that cannot be separated into simpler substances by physical or chemical mean
  11. 18. A positively charged subatomic particle in the nucleus of an atom and contributes to the mass of the atom
  12. 20. negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds