JEE Main - Modern periodic law and periodic table structure One Line Questions & Answers

1. The number of periods in the modern periodic table is: — 7

2. The first element in the p-block is Boron (atomic number 5). Its valence electron configuration is: — 2s^2 2p^1

3. The number of groups in the modern periodic table is: — 18

4. Elements with highly negative electron gain enthalpy are: — Halogens

5. The p-block elements include: — Non-metals, metalloids, and some metals

6. Electron gain enthalpy is the energy change when: — An electron is added to a neutral gaseous atom

7. Henry Moseley's work established the importance of which property in determining the order of elements in the periodic table? — Atomic number

8. The modern periodic law states that the physical and chemical properties of elements are periodic functions of their: — Atomic number

9. Electronegativity is the tendency of an atom to: — Attract electrons in a bond

10. Which of the following is an alkali metal? — Sodium

11. Which of the following is the most metallic element? — Lead

12. Which of the following is a basic oxide? — Barium oxide (BaO)

13. Which element is likely to have a positive electron gain enthalpy? — Neon

14. Metallic character of an element is related to its tendency to: — Lose electrons

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

16. Halogens belong to which group in the periodic table? — Group 17

17. The element with atomic number 3 is Lithium. It belongs to which group? — Group 1

18. The element with atomic number 16 is Sulfur. It belongs to which group? — Group 16

19. The horizontal rows in the periodic table are called: — Periods

20. The element with atomic number 1 is: — Hydrogen

21. Who is credited with developing the first periodic table based on atomic weights? — Dmitri Mendeleev

22. Noble gases are characterized by their: — Full valence electron shells

23. The element with atomic number 2 is: — Helium

24. Atomic radius generally decreases across a period from left to right due to: — Increase in nuclear charge

25. Atomic radius generally increases down a group due to: — Addition of new electron shells

26. Oxidation states of elements in the same group are often similar because they have the same number of: — Valence electrons

27. Which of the following is a metalloid? — Silicon

28. Which of the following has the highest first ionization energy? — Be

29. Which of the following has the smallest atomic radius? — Si

30. Which element is placed in Group 14 of the periodic table? — Carbon

31. Ionization enthalpy generally increases across a period because: — Nuclear charge increases and atomic size decreases

32. Ionization enthalpy generally decreases down a group because: — Atomic size increases and shielding effect increases

33. 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: — Valence electron configuration

34. The element with atomic number 118 is: — Oganesson

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

36. The f-block elements are characterized by the filling of: — f-orbitals

37. Which period in the periodic table contains the largest number of elements? — Period 6

38. The vertical columns in the periodic table are called: — Groups

39. Elements in the same group of the periodic table generally have similar: — Chemical properties

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

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

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

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

44. Which of the following elements has the highest melting point? — Lithium

45. Which of the following is an acidic oxide? — Sulfur trioxide (SO3)

46. Ionization enthalpy is the energy required to remove: — The most loosely held electron from a neutral gaseous atom

47. Transition metals are characterized by the presence of electrons in: — The incompletely filled d-orbitals

48. Lanthanides and actinides are collectively known as: — Inner transition metals

49. The IUPAC name for the element with atomic number 117 is: — Ununseptium

50. Which of the following is a transition metal? — Silver

Modern periodic law and periodic table structure - One Line Questions