Chapter 5 Review

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Chapter 5 Review
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Atomic Theory/Scientists

• Who was the first person to theorize the
  existence of the atom in 400 BC?
• Democritus

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Atomic Theory/Scientists

• Who was given credit as the first person that
  proved the nature of atoms?
• John Dalton

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Atomic Theory/Scientists

• According to Daltons Atomic Theory, all elements
  are composed of tiny indivisible particles
  called_______?
• atoms

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Atomic Theory/Scientists

• Daltons Atomic Theory stated that atoms of the
  same _______ are identical.
• element

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Atomic Theory/Scientists

• Daltons Atomic Theory was for the most part
  correct, except for the fact that atoms can be
  ________.
• divided

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Atomic Theory/Scientists

• Who is credited with discovering the electron?
• JJ Thomson

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Atomic Theory/Scientists

• Experiments with cathode ray tubes led to the
  discovery of the ________.
• electron

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Atomic Theory/Scientists

• The rays produced in the early cathode ray tube
  experiments were attracted to a _________ charge.
• positive

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Atomic Theory/Scientists

• JJ Thomson discovered that electrons have a
  very_____ mass.
• small

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Atomic Theory/Scientists

• Who discovered the proton?
• E. Goldstein

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Atomic Theory/Scientists

• Who discovered the neutron?
• Chadwick

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Atomic Theory/Scientists

• What happened to most of the particles in
  Rutherfords gold foil experiment?
• most passed through the foil

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Atomic Theory/Scientists

• In Rutherfords experiment, a few of the positive
  particles bounced back, so what did he concluded
  they bounced off of?
• a dense positive region called the nucleus

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Atomic Theory/Scientists

• Who discovered the nucleus?
• Rutherford

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Atomic Theory/Scientists

• Which experiment did we re-create in lab using
  wooden boards and marbles?
• Rutherfords gold foil experiment

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Subatomic Particles

• Which subatomic particle has a negative charge?
• electron

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Subatomic Particles

• Which subatomic particle has a positive charge?
• proton

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Subatomic Particles

• Which subatomic particle is neutral?
• neutron

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Atoms

• Atoms are electrically neutral because the number
  of _________ equals the number of ___________.
• protons equal electrons

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Atoms

• What is the charge of the nucleus of an atom?
• positive (because the protons are positive)

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Atoms

• What determines the identity of an element?
• the number of protons

23
Atoms

• Isotopes of the same element differ in what two
  ways?
• mass number and number of neutrons

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Atoms

• What 3 things do isotopes of the same element
  have in common?
• atomic number, number of protons and electrons

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Atoms

• How do you find the number of protons for an
  atom?
• same as the atomic number

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Atoms

• How do you find the number of neutrons for an
  atom?
• mass - atomic

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Atoms

• How do you find the number of electrons for an
  atom?
• same as the atomic number

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Atoms

• All atoms of the same element have the same
  ________ ________.
• atomic number

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Atoms

• What element is the standard for determining
  atomic mass units?
• Carbon - 12

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Atoms

• The average atomic mass depends on the masses of
  the isotopes and the relative __________ of each
  isotope.
• abundance

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Atoms

• What unit is used to measure relative atomic
  mass?
• amus

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Atoms

• The atomic mass listed on the periodic table is a
  _______ atomic mass.
• average

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Atoms

• Sodium has atomic number 11. If a sodium atom
  has a mass of 23, how many protons does it have?
• 11
• (same as atomic number)

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Atoms

• Sodium has atomic number 11. If a sodium atom
  has a mass of 23, how many neutrons does it have?
• 12
• (subtract mass-atomic)

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Atoms

• Sodium has atomic number 11. If a sodium atom
  has a mass of 23, how many electrons does it
  have?
• 11
• same as atomic number

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Atoms

• A carbon atom has 6 protons, 6 electrons and 8
  neutrons. What is its mass number?
• 14 (protons neutrons)

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Atoms

• A carbon atom has 6 protons, 6 electrons and 8
  neutrons. What is its atomic number?
• 6 (same as protons)

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Atoms

• Hg-200 has an atomic number of 80. How many
  neutrons does it have?
• 120

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Atoms

• Hg-200 has an atomic number of 80. How many
  protons does it have?
• 80

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Atoms

• Hg-200 has an atomic number of 80. How many
  electrons does it have?
• 80

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