physical science 11/5

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Across
  1. 2. mass- the mass of an atom expressed in atomic mass units, the weighted average of the masses of all naturally occurring isotopes of an element
  2. 3. mechanics- a branch of physics that explores the behavior of matter and energy at the atomic and subatomic level
  3. 5. pudding model- an atomic model developed by J.J Thomas that views atoms as spheres of positively charged materials with embedded electrons
  4. 10. a negatively charged ion
  5. 12. mechanical model- current accepted atomic model in which electrons are found in orbitals that are positioned around a nucleus that contains protons (usually) neutrons
  6. 14. an atom of an element that has a different number of neutrons compared with other atoms of that element, resulting in a different mass number
  7. 16. smallest of main subatomic particles located outside the nucleus having a negative charge and mas that is 1/186th that of a proton
  8. 17. model- an atomic model developed by Niels Bohr in which electrons travel in distinct spherical regions called energy levels at fixed distances from the nucleus
Down
  1. 1. number r- unique number of protons found in every atom of a particular element
  2. 4. subatomic particle found in the nucleus of most atoms that has no electrical charge and a mass slightly greater than a proton
  3. 6. of electrical charges- the law states that opposite electrical charges attract each other while like charges repel each other
  4. 7. number- total number of particles found in the nucleus of a particular isotope of an element
  5. 8. a positivly chchargedon
  6. 9. charged atom of groups atoms that have gained or lost electrons, producing an unequal number of protons and electrons
  7. 11. model- model developed by Rutherfordherfor in which an atom is made up of a tiny dense positive charger central nuclear surrounded by negatively charged electrons
  8. 13. subatomic particle found in the nucleus of an atom and having a positive charge and a mass slightly less than that of a neutron
  9. 15. levels- Bohr model of the atom regions located at fixed distances from the nucleus of an atom in which electrons are fixed