Chapter 3 Review1

1
Chapter 3 Review-1

• Dalton's atomic theory helped to explain the law
  of conservation of mass because it stated that
  _______ could not be created or destroyed.
• Millikan's experiments with the electron showed
  that the ________ carried the smallest possible
  negative charge.
• The basic principles of atomic theory that are
  still recognized today were first conceived by
  _________.
• The rays produced in a cathode tube in early
  experiments were deflected away from a __________
  plate.
• If 4 grams of element A combine with 40 grams of
  element B, then 12 grams of element A will
  combine with ____ grams of element B.
• The law of multiple proportions was proposed by
  _________.

2
Chapter 3 Review-2

• The hydrogen isotope with the HIGHEST mass is
  named or called __________.
• The relative masses of all atoms are based on the
  mass of one atom of _________ isotope being equal
  to 12 mass units.
• The mass of the ________ is about the same as
  that of a proton.
• Most of the ______ of an atom is made up of the
  electron cloud.
• In Rutherford's experiment, a very few of the
  positively-charged particles were greatly
  deflected as they hit the piece of gold metal.
• The hydrogen isotope with the LOWEST mass is
  named or called _________.
• Atoms of the same element can differ in _______
  number, BUT NEVER in their atomic number.

3
Chapter 3 Review-3

• Aluminum-30 has as atomic number of 13. How many
  neutrons does this isotope have?
• Neon has an atomic number of 10. Calcium has an
  atomic number of 20. Compared to a mole of neon,
  a mole of calcium contains the same number of
  ________.
• All atoms of the same element have the same
  number of _____ and electrons.
• Sulfur has an atomic number of 16. What is the
  mass number of the isotope contain 16 neutrons?
• What is 6.022 x 1023 atoms?
• As the mass number of the isotopes of a
  particular element increases, the number of
  _________ remains the same.

4
Chapter 3 Review-4

• What scientist discovered that electrons were
  negatively charged and had mass?
• Atoms of the same element that have different
  masses are called _________ and nuclides.
• The short-range attractive forces that hold the
  nuclear particles together are called ________
  forces.
• Silicon-31 contains 14 protons. How many
  electrons does an atom of silicon 31 contain?
• The smallest indivisible unit of matter is called
  a(n) _______.
• The negatively charged subatomic particles that
  surround or orbit the nucleus are called
  __________.
• Phosphorus-30 has an atomic number of 15. How
  many neutrons does this isotope have?

5
Chapter 3 Review-5

• ALL sub-atomic particles found in the nucleus of
  an atom are called __________.
• The weighted average of the atomic masses of the
  naturally occurring ____of an element is referred
  to as average atomic mass.
• The amount of a substance that contains a number
  of particles equal to the number of atoms in
  exactly 12 g in a carbon-12 is referred to as a
  ________.
• The mass in grams of one mole of an element in a
  compound is referred to as the _______ mass of
  the atom.
• The number of protons in the nuclei of the atoms
  of a particular element is referred to as the
  ________ number.
• The electrically neutral, subatomic particles
  found in the nuclei of atoms are called _________.

6
Chapter 3 Review-6

• The positive plate on the cathode ray tube is
  called the _______.
• What scientist discovered that the nucleus was
  very dense and positively charged?
• What scientist proposed the law of definite
  proportions or the law of definite composition?
• The atomic mass of silver is 107.9 amu, what is
  its molar mass?
• Isotopes of an element differ in the number of
  _______ in their nuclei.
• The two oxides of lead, PbO and PbO2, are
  explained by the law of __________ proportions.
• The negative plate on the cathode ray tube is
  called the _______.
• What particles make up protons and neutrons?