JEE Main - Modern periodic law and periodic table structure Online Test (MCQ Quiz)

1. Who is credited with developing the first periodic table based on atomic weights?

A) Henry Moseley B) Dmitri Mendeleev C) Antoine Lavoisier D) John Newlands

2. The modern periodic law states that the physical and chemical properties of elements are periodic functions of their:

A) Atomic weight B) Atomic number C) Number of neutrons D) Electron configuration

3. Which element was predicted by Mendeleev and later discovered, fitting perfectly into his periodic table?

A) Gallium B) Germanium C) Scandium D) Technetium

4. Henry Moseley's work established the importance of which property in determining the order of elements in the periodic table?

A) Atomic mass B) Atomic number C) Melting point D) Electronegativity

5. The horizontal rows in the periodic table are called:

A) Groups B) Periods C) Series D) Blocks

6. The vertical columns in the periodic table are called:

A) Periods B) Series C) Groups D) Blocks

7. Elements in the same group of the periodic table generally have similar:

A) Physical states B) Atomic radii C) Chemical properties D) Number of periods

8. Which period in the periodic table contains the largest number of elements?

A) Period 1 B) Period 3 C) Period 6 D) Period 7

9. The element with atomic number 1 is:

A) Helium B) Hydrogen C) Lithium D) Boron

10. Which of the following is an alkali metal?

A) Calcium B) Sodium C) Aluminum D) Chlorine

11. Halogens belong to which group in the periodic table?

A) Group 1 B) Group 17 C) Group 18 D) Group 2

12. Noble gases are characterized by their:

A) High reactivity B) Low ionization energy C) Full valence electron shells D) Tendency to form positive ions

13. Which block of the periodic table contains elements with the valence electrons in the d-orbitals?

A) s-block B) p-block C) d-block D) f-block

14. Lanthanides and actinides are collectively known as:

A) Transition metals B) Alkali metals C) Inner transition metals D) Noble gases

15. The element with atomic number 118 is:

A) Oganesson B) Radon C) Ununennium D) Copernicium

16. Which of the following is a metalloid?

A) Iron B) Copper C) Silicon D) Sulfur

17. Atomic radius generally decreases across a period from left to right due to:

A) Increase in nuclear charge B) Decrease in nuclear charge C) Addition of new electron shells D) Shielding effect of inner electrons

18. Atomic radius generally increases down a group due to:

A) Increase in nuclear charge B) Decrease in nuclear charge C) Addition of new electron shells D) More effective nuclear attraction

19. Ionization enthalpy is the energy required to remove:

A) The most loosely held electron from a neutral gaseous atom B) An inner shell electron from a gaseous ion C) An electron from a solid metal D) Any electron from a molecule

20. Ionization enthalpy generally increases across a period because:

A) Nuclear charge increases and atomic size decreases B) Nuclear charge decreases and atomic size increases C) Number of electron shells increases D) Shielding effect increases significantly

21. Ionization enthalpy generally decreases down a group because:

A) Nuclear charge increases and atomic size decreases B) Nuclear charge decreases and atomic size increases C) Atomic size increases and shielding effect increases D) Effective nuclear charge increases

22. Electron gain enthalpy is the energy change when:

A) An electron is added to a neutral gaseous atom B) An electron is removed from a gaseous atom C) A molecule loses an electron D) A metal loses electrons

23. Elements with highly negative electron gain enthalpy are:

A) Alkali metals B) Alkaline earth metals C) Halogens D) Noble gases

24. Electronegativity is the tendency of an atom to:

A) Attract electrons in a bond B) Donate electrons C) Lose electrons easily D) Form ionic bonds

25. Electronegativity generally increases across a period and decreases down a group. Which element is the most electronegative?

A) Oxygen B) Nitrogen C) Fluorine D) Chlorine

26. Metallic character of an element is related to its tendency to:

A) Gain electrons B) Lose electrons C) Form covalent bonds D) Have high ionization energy

27. Metallic character generally decreases across a period and increases down a group. Which of the following is the least metallic?

A) Sodium B) Magnesium C) Aluminum D) Sulfur

28. Which of the following is the most metallic element?

A) Carbon B) Silicon C) Germanium D) Lead

29. Oxidation states of elements in the same group are often similar because they have the same number of:

A) Inner electrons B) Protons C) Valence electrons D) Neutrons

30. The first element of Period 2 is Lithium (Li) and the first element of Period 3 is Sodium (Na). They are in the same group because they have the same:

A) Number of electron shells B) Valence electron configuration C) Atomic number D) Number of neutrons

31. Which of the following elements has the highest melting point?

A) Sodium B) Potassium C) Lithium D) Cesium

32. The p-block elements include:

A) Alkali metals and alkaline earth metals B) Transition metals and inner transition metals C) Non-metals, metalloids, and some metals D) Lanthanides and actinides

33. Which element is placed in Group 14 of the periodic table?

A) Nitrogen B) Carbon C) Boron D) Oxygen

34. The first element in the p-block is Boron (atomic number 5). Its valence electron configuration is:

A) 2s^2 2p^1 B) 2s^1 2p^2 C) 2s^2 2p^3 D) 2s^1 2p^0

35. The f-block elements are characterized by the filling of:

A) p-orbitals B) d-orbitals C) f-orbitals D) s-orbitals

36. Which of the following is a transition metal?

A) Zinc B) Silver C) Copper D) Nickel

37. Transition metals are characterized by the presence of electrons in:

A) The outermost s-orbital B) The outermost p-orbital C) The incompletely filled d-orbitals D) The incompletely filled f-orbitals

38. The element with atomic number 57 is Lanthanum (La). It is the first element of the lanthanide series. What is its block?

A) s-block B) p-block C) d-block D) f-block

39. The element with atomic number 89 is Actinium (Ac). It is the first element of the actinide series. What is its block?

A) s-block B) p-block C) d-block D) f-block

40. The IUPAC name for the element with atomic number 117 is:

A) Ununseptium B) Ununoctium C) Ununpentium D) Ununtrium

41. The element with atomic number 3 is Lithium. It belongs to which group?

A) Group 1 B) Group 2 C) Group 13 D) Group 14

42. The element with atomic number 16 is Sulfur. It belongs to which group?

A) Group 14 B) Group 15 C) Group 16 D) Group 17

43. Which of the following has the smallest atomic radius?

A) Na B) Mg C) Al D) Si

44. Which of the following has the highest first ionization energy?

A) Li B) Be C) B D) C

45. Which element is likely to have a positive electron gain enthalpy?

A) Fluorine B) Chlorine C) Bromine D) Neon

46. Which of the following is an acidic oxide?

A) Sodium oxide (Na2O) B) Magnesium oxide (MgO) C) Sulfur trioxide (SO3) D) Calcium oxide (CaO)

47. Which of the following is a basic oxide?

A) Carbon dioxide (CO2) B) Phosphorus pentoxide (P4O10) C) Sulfur dioxide (SO2) D) Barium oxide (BaO)

48. The number of periods in the modern periodic table is:

A) 10 B) 18 C) 7 D) 9

49. The number of groups in the modern periodic table is:

A) 7 B) 18 C) 10 D) 9

50. The element with atomic number 2 is:

A) Hydrogen B) Helium C) Lithium D) Beryllium

Modern periodic law and periodic table structure - Online Test

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