Periodic Table & Periodicity MCQs: Historical Development: Mendeleev to Modern

Introduction: Welcome to this MCQ set on the historical development of the periodic table, covering Mendeleev’s contributions and the evolution to the modern periodic table. Test your understanding, then check the answer key at the end.

1. Who is known as the “Father of the Periodic Table”?
   (a) John Newlands
   (b) Dmitri Mendeleev
   (c) Henry Moseley
   (d) Lothar Meyer
   
2. Mendeleev arranged elements in his periodic table based on:
   (a) Atomic number
   (b) Atomic mass
   (c) Number of neutrons
   (d) Electronic configuration
   
3. Mendeleev left gaps in his periodic table to:
   (a) Adjust the alignment of elements
   (b) Maintain equal spacing between elements
   (c) Accommodate elements that were yet to be discovered
   (d) Indicate missing isotopes
   
4. Which scientist corrected the periodic table by arranging elements in order of atomic number instead of atomic mass?
   (a) J.J. Thomson
   (b) Henry Moseley
   (c) Ernest Rutherford
   (d) Glenn T. Seaborg
   
5. The periodic law, as modified by Moseley, states that:
   (a) Properties of elements are periodic functions of their atomic masses
   (b) Properties of elements are periodic functions of their atomic numbers
   (c) All elements are arranged by their mass number
   (d) Elements in the same period have similar properties
   
6. Who proposed the “Law of Octaves” for arranging elements?
   (a) John Newlands
   (b) Lothar Meyer
   (c) Niels Bohr
   (d) Ernest Rutherford
   
7. According to Newlands’ Law of Octaves, every eighth element:
   (a) Has the same mass
   (b) Is a noble gas
   (c) Shows properties similar to the first
   (d) Forms a diatomic molecule
   
8. Mendeleev’s periodic table arranged elements primarily based on:
   (a) Increasing atomic number
   (b) Increasing atomic mass
   (c) Electron configuration
   (d) Ionization energy
   
9. Which scientist developed a periodic table almost simultaneously with Mendeleev?
   (a) John Dalton
   (b) Lothar Meyer
   (c) Henry Moseley
   (d) Glenn T. Seaborg
   
10. In the modern periodic table, elements are arranged in order of:
    (a) Increasing atomic mass
    (b) Increasing atomic number
    (c) Decreasing reactivity
    (d) Increasing number of isotopes
    
11. Which of the following was a major limitation of Mendeleev’s periodic table?
    (a) It did not include transition metals
    (b) It was arranged by atomic number
    (c) The position of hydrogen was uncertain
    (d) It could not explain the existence of isotopes
    
12. Which scientist introduced the concept of atomic number?
    (a) Henry Moseley
    (b) John Dalton
    (c) Ernest Rutherford
    (d) J.J. Thomson
    
13. The modern periodic table is based on:
    (a) Mendeleev’s periodic law
    (b) Moseley’s atomic number concept
    (c) Newlands’ law of octaves
    (d) Rutherford’s atomic model
    
14. The horizontal rows in the periodic table are called:
    (a) Groups
    (b) Families
    (c) Periods
    (d) Series
    
15. The vertical columns in the periodic table are called:
    (a) Groups
    (b) Periods
    (c) Shells
    (d) Blocks
    
16. How many periods are present in the modern periodic table?
    (a) 6
    (b) 7
    (c) 8
    (d) 10
    
17. How many groups are present in the modern periodic table?
    (a) 8
    (b) 16
    (c) 18
    (d) 20
    
18. Which element is placed at the top of Group 1 in the modern periodic table?
    (a) Helium
    (b) Hydrogen
    (c) Lithium
    (d) Sodium
    
19. The noble gases are placed in which group of the periodic table?
    (a) Group 16
    (b) Group 17
    (c) Group 18
    (d) Group 19
    

Answer Key

1. (b) Mendeleev is considered the “Father of the Periodic Table.”
2. (b) Mendeleev arranged elements by increasing atomic mass.
3. (c) Mendeleev left gaps for undiscovered elements.
4. (b) Henry Moseley arranged elements by atomic number.
5. (b) Moseley’s periodic law is based on atomic numbers.
6. (a) John Newlands proposed the Law of Octaves.
7. (c) Every eighth element had similar properties.
8. (b) Mendeleev’s periodic table was based on atomic mass.
9. (b) Lothar Meyer developed a similar periodic table.
10. (b) The modern periodic table is arranged by atomic number.
11. (c) Hydrogen’s position was uncertain in Mendeleev’s table.
12. (a) Henry Moseley introduced atomic number.
13. (b) The modern periodic table is based on atomic number.
14. (c) Horizontal rows in the periodic table are called periods.
15. (a) Vertical columns are called groups.
16. (b) There are 7 periods in the periodic table.
17. (c) There are 18 groups in the periodic table.
18. (b) Hydrogen is placed at the top of Group 1.
19. (c) Noble gases are in Group 18.