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Eighth Grade (Grade 8) Atomic Structure Questions

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Grade 8 Atomic Structure
Compared to the charge and mass of a proton, an electron has                                   .
  1. the same charge and a smaller mass
  2. the same charge and the same mass
  3. opposite charge and smaller mass
  4. opposite charge and the same mass
Grade 8 Atomic Structure
Atoms consist of which of the following?
  1. Protons
  2. Molecules
  3. Neutrons
  4. Electrons
Grade 8 Atomic Structure
A particle that cannot be broken down further is a(n)
  1. compound.
  2. mixture.
  3. element.
  4. atom.
Grade 8 Atomic Structure
A(n)                 is the building block of matter.
  1. nucleus
  2. atom
  3. proton
  4. electron
Grade 8 Atomic Structure
Kayla draws the image shown as part of her physical science homework.
Electron-Dot Diagram - Phosphorus
What did Kayla draw?
  1. Bohr model
  2. Lewis structure
  3. Molecular formula
  4. Structural formula
Grade 8 Atomic Structure
The mass of a neutron is
  1. about equal to the mass of a proton.
  2. much less than the mass of a proton.
  3. about equal to the mass of an electron.
  4. much less than the mass of an electron.
Grade 8 Atomic Structure
Isotopes are atoms of the same element with the same number of protons and
  1. a different number of electrons.
  2. a different number of molecules.
  3. a different number of neutrons.
  4. the same number of neutrons.
Grade 8 Atomic Structure
Negatively-charged particles in the atom are called                .
  1. electron cloud
  2. nucleus
  3. electrons
  4. protons
Grade 8 Atomic Structure
In an element with a neutral charge, the atomic number is equal to the number of
  1. atoms.
  2. nucleus.
  3. protons.
  4. electrons.
  5. both c and d are correct.
Grade 8 Atomic Structure
The negatively-charged particles in an atom are called                .
  1. protons
  2. negatrons
  3. electrons
  4. neutrons
Grade 8 Atomic Structure
In a neutral atom, the number of protons                   the number of electrons.
  1. equals
  2. is less than
  3. is greater than
  4. none of the above
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