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Across 3. a real gas behaving as a gas with low pressure and high temperature 4. indicates how strongly an atom of an element attracts electrons in a chemical bond 8. the weighted average of the masses of an element's naturally occuring isotopes 11. the simplest whole-number ratio of atoms of the elements in a compound 12. a table in which elements are spread out, giving an indication of the physical and chemical properties of each element 15. the outermost electrons in an atom 16. demonstrate differences in atomic radius, ionic radius, electronegativity, first ionization energy, and metaliic/nonmetallic properties of elements within the same group or across the same period 17. the actual ratio of atoms in a molecule of that compound 18. a measurement of the average kinetic energy in a sample of material 20. regions of the most probable electron location(ground state) 21. composed of two or more different substances that can be separated by physical means 22. can represent the valence electron arrangement in elemnts, compounds, and ions 23. a compound formed when nonmetals react with other nonmetals 24. the gram-formula mass of a substance which equals one mole of that substance 25. particles contained in the nucleus which include protons and netrons

Down 1. represents conservation of mass 2. substances that can be differentiated by their physical and chemical properties. 5. the energy associated with the random motion of atoms and molecules 6. the sum of the atomic masses of a substance's atoms 7. formed from the reaction of metals and nonmetals 9. have stable valence configurations and tend not to bond 10. a substance composed of two or more different elements that are chemically combined in a fixed proportion 13. describes how an element behaves during a chemical reaction 14. a model in which the electrons are in orbitals 19. atoms of an element that contain the same # of prtons but a different # of neutrons