Quiz  /  Atomic Structure Class 12 MCQ Questions With Answers

  • 1. 
    What element does the Bohr Model represent?

  • Nitrogen
  • Potassium
  • Sodium

  • 2. 
    If an element has 14 protons, 15 neutrons, and 14 electrons, what is that elements atomic mass

  • 28
  • 14
  • 29
  • All of above

  • 3. 
    Alkali metals are located where on the periodic table?

  • Group (column 1)
  • Group 8 and Period 4
  • Period 7
  • None of these

  • 4. 
    Alkaline Earth Metals...

  • are semiconductors
  • are the most reactive type of elements
  • have two valence electrons
  • All of above

  • 5. 
    The smallest possible unit matter can be divided into while still maintaining its properties.

  • Proton
  • Atom
  • Element

  • 6. 
    The area of the atom where protons and neutrons are found

  • Electron Cloud
  • Nucleus
  • Energy Level

  • 7. 
    The vertical rows of the periodic table, also called families

  • Groups
  • Periods
  • Rows

  • 8. 
    What is the mass number of this atom?

  • 1
  • 3
  • 4
  • 7

  • 9. 
    Which subatomic particles contribute the most to the mass of an atom?

  • Protons, Neutrons, Electrons
  • Protons only
  • Protons and Electrons
  • Protons and Neutrons

  • 10. 
    Which of the following determines the identity of an element?

  • number of protons
  • atomic mass
  • number of neutrons
  • number of shells

  • 11. 
    What is the mass number?

  • the number of protons in the nucleus
  • the number of protons and neutrons in the nucleus
  • the number of neutrons in the nucleus
  • the number of protons and electrons in the atom

  • 12. 
    If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

  • 12 neutrons
  • 12 electrons
  • 12 protons
  • 24 protons and neutrons

  • 13. 
    What is the atomic number of the atom pictured?

  • 9
  • 10
  • 18
  • 19

  • 14. 
    What is similar between the elements in the same group?

  • They have the same atomic mass.
  • They have the same energy levels.
  • They have the valence electrons.

  • 15. 
    A design of an atom showing the nucleus as well as the electrons their designated orbits

  • Periodic Table
  • Bohr Model
  • Electron Cloud

  • 16. 
    When you have a negative ion of an atom, O-2 for example, do you have a higher number of protons or electrons?

  • Number of protons
  • Number of electrons

  • 17. 
    What is the atomic number?

  • the number of protons in the nucleus
  • the number of protons and neutrons in the nucleus
  • the number of neutrons in the nucleus
  • the number of protons in the energy levels

  • 18. 
    What two subatomic particles must be equal for an atom to have no charge (neutral).

  • protons and neutrons
  • protons and electrons
  • electrons and neutrons

  • 19. 
    Iodine-131The -131 tells you the

  • number of protons.
  • atomic mass.
  • charge of the atom.

  • 20. 
    When you have a positive ion of an atom, Na+1 for example, do you have a higher number of protons or electrons?

  • Number of protons
  • Number of electrons

  • 21. 
    Which part of an atom is used to identify it?

  • number of protons
  • number of neutrons
  • number of electrons

  • 22. 
    When you two atoms with different masses, Carbon-12 and Carbon-13 for example, what type of atom do you have?

  • Neutral atom
  • Ion
  • Isotope

  • 23. 
    Look at this picture of Argon off the periodic table. Which of the following is true for this element?

  • 18 protons
  • 40 protons
  • 22 protons
  • 21.9 protons

  • 24. 
    What subatomic particles would you find in the nucleus of an atom?

  • Protons only
  • Protons and Neutrons
  • Neutrons and Electrons
  • Protons and Electrons

  • 25. 
    When you have an ion of an atom, O-2 for example, what has changed in the atomic structure?

  • Number of protons
  • Number of neutrons
  • Number of electrons

  • 26. 
    Which other element has the same number of valence electrons as chlorine?

  • Sodium
  • Bromine
  • Oxygen
  • Both A & B

  • 27. 
    An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

  • 15
  • 31
  • 16
  • 47

  • 28. 
    An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

  • 20
  • 10
  • 35
  • 25

  • 29. 
    The different energy levels of electrons as they orbit the nucleus

  • Electron Cloud
  • Orbitals (Energy Levels)
  • 2, 8, 18, 32

  • 30. 
    When you two isotopes of an atom, Carbon-12 and Carbon-13 for example, what has changed in the atomic structure?

  • Number of protons
  • Number of neutrons
  • Number of electrons
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