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Ninth Grade (Grade 9) Atomic Structure Questions

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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
  4. neutron cloud
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
                is equal to the number of protons and the number of neutrons.
  1. Atomic number
  2. Ionic number
  3. Covalent number
  4. Atomic Mass
  5. Atoms
Grade 9 Atomic Structure
                are formed when an atom gains or loses electrons.
  1. Ions
  2. Atoms
  3. Electrons
  4. Protons
  5. Bonds
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
Which particles make up atoms?
  1. protons, neutrons, electrons
  2. protons, electrons, nuclei
  3. electrons, neutrons, ions
  4. neutrons, electrons, molecules
Grade 9 Atomic Structure
Atoms become positively charged when it                 .
  1. shares electrons
  2. loses electrons
  3. loses protons
  4. gains electrons
  5. gains protons
Grade 9 Atomic Structure
Strong forces bind protons and neutrons together to form the                .
  1. nucleus
  2. electrons
  3. protons
  4. neutrons
  5. Atoms
Grade 9 Atomic Structure
Isotopes of an element have the same number of                  .
  1. electrons
  2. neutrons
  3. protons
  4. valence electrons
Grade 9 Atomic Structure
An atom is electrically neutral if the number of                                            .
  1. electrons is equal to the atom mass
  2. neutrons is equal to electrons
  3. neutrons is equal to atom number
  4. protons is equal to the number of electrons
Grade 9 Atomic Structure
Two atoms can share more than one pair of                     .
  1. protons
  2. neutrons
  3. electrons
  4. interparticle forces
Grade 9 Atomic Structure
Which subatomic particle has a positive charge?
  1. proton
  2. neutron
  3. electron
  4. nucleus
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