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Electrons (Grade 6)

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Electrons are found outside the nucleus.
  1. True
  2. False
Valence electrons are the electrons in the outermost shell.
  1. True
  2. False
The electron cloud is a visual model of the probable locations of electrons in an atom.
  1. True
  2. False
Electrons have what type of charge?
  1. positive
  2. negative
  3. neutral
  4. none
The scientist who first discovered electrons was               .
  1. Rutherford
  2. Bohr
  3. Thompson
  4. Democritus
What can you conclude from the fact that electrons orbit far away from the atomic nuclei?
  1. Electrons are extremely small.
  2. Protons have a positive charge.
  3. Atoms consist of subatomic particles.
  4. Atoms are mostly empty space.
What is the maximum number of electrons that can fit in the first energy level around the nucleus of an atom?
  1. 2
  2. 8
  3. 13
  4. 18
What is the greatest number of valence electrons an atom can have?
  1. 2
  2. 3
  3. 8
  4. 12
When an atom gains an electron, it
  1. acquires a negative charge and becomes a negative ion.
  2. acquires a positive charge and becomes a positive ion.
  3. becomes electrically neutral.
  4. always has an uneven number of valence electrons.
Which of the following best describes an electron?
  1. It has no charge and about the same mass as a proton.
  2. It has a negative charge and much less mass than a proton.
  3. It has a positive charge and much more mass than a neutron.
  4. It has a negative charge and about the same mass as a neutron.
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