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Ninth Grade (Grade 9) Atomic Structure Questions

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Grade 9 Atomic Structure
Which subatomic particle has a positive charge?
  1. proton
  2. neutron
  3. electron
  4. nucleus
Grade 9 Atomic Structure
Grade 9 Atomic Structure
Grade 9 Atomic Structure
Why does an atom have no net electric charge?
  1. Its subatomic particles carry no electrical charge.
  2. The positively charged protons cancel out the negatively charged neutrons.
  3. The positively charged neutrons cancel out the negatively charged electrons.
  4. The positively charged protons cancel out the negatively charged electrons.
Grade 9 Atomic Structure
What are the three particles that make up an atom?
  1. protons, neutrons, and isotopes
  2. neutrons, isotopes, and electrons
  3. positives, negatives, and electrons
  4. protons, neutrons, and electrons
Grade 9 Atomic Structure
The center of an atom is called the
  1. electron.
  2. proton.
  3. nucleus.
  4. carbon.
  5. ion.
Grade 9 Atomic Structure
Grade 9 Atomic Structure
What does the octet rule state?
  1. Atoms become less stable with eight electrons in their outer energy level.
  2. Atoms become more stable with eight electrons in their outer energy level.
  3. Atoms will change their configurations and become a noble gas.
  4. Atoms will become more reactive and chemically bond with noble gases.
Grade 9 Atomic Structure
The region around the nucleus occupied by the electrons is called the
  1. negative zone.
  2. electric cloud.
  3. electron cloud.
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