Atoms & Periodic Table of Elements

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Across
  1. 2. Electrons have a ___ charge and are located in the cloudlike region around the nucleus.
  2. 5. Each element is distinguished by then number of ___ in the nuclei of its atoms.
  3. 8. Elements on the ___ side of the periodic table are metals.
  4. 11. Elements in the same vertical column or group of the periodic table contain the same number of electrons in their outer energy levels. These electrons are called ___ electrons and give rise to similar chemical properties.
  5. 13. ___ are the basic building blocks of all matter.
  6. 16. Atomic mass is equivalent to the number of protons and ___ in the atom of an element.
  7. 17. The boxes in the periodic table are arranged in increasing order of ___ ___.
  8. 19. Atoms of an element with differing numbers of neutrons are known as ___.
  9. 20. Neutrons have a ___ charge and are located in the nucleus.
Down
  1. 1. ___ are shiny, ductile, malleable, and good conductors of heat and electricity.
  2. 3. The ___ ___ model best represents our current understanding of the atomic structure. It attempts to show the three-dimensional shape of the atom and show that the exact location of electrons can not be known.
  3. 4. Protons have a ___ charge and are located in the nucleus.
  4. 6. The horizontal rows of the periodic table are called ___.
  5. 7. Most of the mass of an atom is located in the ___.
  6. 9. ___ occur along the stair-step line of the periodic table and have both metallic and non-metallic properties.
  7. 10. Gaining or losing a proton makes an atom a completely ___ element.
  8. 12. The electron cloud accounts for most of the ___ of the atom.
  9. 14. Gaining or losing electrons makes an atom an ___.
  10. 15. The vertical columns in the periodic table are called ____. They are also commonly referred to as families.
  11. 18. The ___ model is an inaccurate model and does not depict the 3-D nature of the atom; it implies that electrons are in static orbits.