Structure of the Atom & Periodic Table

Edit Answers
12345678910111213
Across
  1. 2. A _______ is a particle with a positive charge.
  2. 5. These electrons are in the last shell or energy level of an atom.
  3. 8. ______ is a tabular arrangement of the chemical elements by increasing atomic number with displays the elements so that one may see trends in their properties.
  4. 10. ______ developed the modern atomic theory.
  5. 13. ______ composed of two or more elements.
Down
  1. 1. This is also referred to as a "Rare" gas, found in group 18 of the Periodic Table.
  2. 3. An ______ is chemically the simplest substances and hence cannot be broken down using chemical methods.
  3. 4. ______ the creator of the periodic table.
  4. 6. An _______ is a particle with a negative charge.
  5. 7. _____ is the lowest allowed energy state of an atom, molecule, or ion.
  6. 9. The ______ is the number of protons found in the nucleus of an atom.
  7. 11. ______ is Full of protons and neutrons.
  8. 12. A _______ is a particle with no charge.