Chapter 3 Physical Science

Edit Answers
123456789101112131415161718
Across
  1. 2. a subatomic particle found in the nucleus of an atom and having a positive charge and a mass slightly less than that of a neutron
  2. 4. a negatively charged ion
  3. 6. pudding-the atomic model developed by J.J Thomson that views atoms as spheres of positively charged material with embedded electrons
  4. 13. model- the currently accepted atomic model in which electrons are found in orbitals that are positioned around a nucleus that contains protons and (usually) neutrons
  5. 16. number-the total number of particles found in the nucleus of a particle isotope of an element
  6. 17. number- the unique number of protons found in every atom of a particular element
  7. 18. level- In the Bohr model of the atom, the regions located at fixed distances from the nucleus of an atom in which electrons are found
Down
  1. 1. the smallest of the main subatomic particles, located outside the nucleus, having a negative charge and a mass
  2. 3. a charged atom or group of atoms that has gained or lost electrons, producing an unequal number of protons and electrons
  3. 5. a subatomic particle found in the nucleus of most atoms that has no electrical charge and a mass slightly greater than that of a proton
  4. 7. of electrostatic charges-when opposite electrical charges attract each other, while the same charges repel each other
  5. 8. a workable explanation or description of a phenomenon
  6. 9. mechanics- the branch of physics that explores the behavior of matter and energy at the atomic and subatomic level
  7. 10. model- the atomic model developed by Ernest Rutherford in which an atom is made up of a tiny, dense, positively charged central nucleus surrounded by negatively charged electrons
  8. 11. mass- the mass of an atom expressed in atomic mass units;the weighted average of the masses of all the naturally occurring isotopes of an element
  9. 12. a positively charged ion
  10. 14. model- the atomic model developed by Biels Bohr in which electrons travel in distinct spherical regions called energy levels at fixed distances from the nucleus
  11. 15. 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