Periodic Table and Periodicity of Properties – MCQ’s

Periodic Table and Periodicity of Properties – MCQ’s

1. Shielding effect is greater in atoms with greater number of:

(a) Protons

(b) Neutrons

(c) Electrons  ✓

(d) Positrons

2. There are total ____ groups and _____ periods in the modern periodic table:

(a) Seven, eight

(b) Eighteen, seven    ✓

(c) Eight, seventeen

(d) Sixteen, eight

3. If we move from left to right in a period, the value of ionization energy:

(a) Remains same

(b) Decreases

(c) Increases             ✓

(d) Not effected

4. The ionization energy of sodium is:

(a) +495.8 kj/mol  ✓

(b) +594.8 kj/mol

(c) -495.8 kj/mol

(d) -594.8 kj/mol

5. It is the amount of energy released when an electron is added up in the outermost shell of an isolated gaseous atom:

(a) Shielding effect

(b) Electron affinity  ✓

(c) Electro negativity

(d) Ionization energy

6. Salts of sodium give:

(a) Bluish green

(b) Red

(c) Yellow          ✓

(d) Green

7. The half of distance between the nuclei of the two bonded atoms is referred as:

(a) Atomic size

(b) Atomic radius

(c) Ionic radii

(d) Both (a) and (b) ✓

8. Sixth and seventh periods are called:

(a) Short period

(b) Normal period

(c) Long period

(d) Very long period ✓

9. The d-block elements lie between the blocks:

(a) s-p            ✓

(b) d-f

(c) p-s

(d) f-d

10. Which one of the halogens has the highest electro-negativity?

(a) Bromine

(b) Iodine

(c) Chlorine

(d) Fluorine ✓

11. The shielding effect of the inner electrons is responsible for:

(a) Increasing ionization energy value

(b) Decreasing ionization energy value ✓

(c) Increasing electron affinity

(d) Increasing electronegativity

12. According to the modern periodic law, the properties of the elements are periodic function of their:

(a) Atomic number           ✓

(b) Number of electrons

(c) Mass number

(d) Number of valence electrons

13. Which is the best reason for increasing ionization energy from left to right in a period?

(a) The shielding effect remains the same

(b) The nuclear chare increases          ✓

(c) The number of inner electrons increases

(d) Increasing electronegativity

14. Units of ionization energy are:

(a) Calones/mol

(b) kj/mol                   ✓

(c) kj

(d) j/mol

15. 5-f series of inner transition elements are called:

(a) Lanthanides

(b) Actinides            ✓

(c) Halogens

(d) Alkali metals

16. Halogens belong to group:

(a) 17                     ✓

(b) 16

(c) 18

(d) 32

17. How many elements are there in 4^th period of the periodic table?

(a) 7

(b) 8

(c) 18                ✓

(d) 32

18. Which one is the incomplete period in the periodic table?

(a) fourth period

(b) second period

(c) seventh period    ✓

(d) first period

19. Which scientist had given the idea of octaves for the arrangement of elements?

(a) Mendeleev

(b) Al-Razi

(c) Newlands        ✓

(d) Dobereiner

20. Atomic number of K = 19. Its valence shell configuration is:

(a)  4s¹                  ✓

(b) 3s¹

(c) 6s¹

(d) 5s¹

21. Keeping in view the size of atom, which order is the correct one?

(a) Mg > Sr

(b) Ba> Mg        ✓

(c) Ca > Ba

(d) Cl > I

22. In 5^th period the elements have range from:

(a)  19 to 36

(b) 37 to 54              ✓

(c) 11 to 18

(d) 55 to 86

23. Zero group or noble gases have general electronic configuration.

(a)  ns², np²

(b) ns², np⁴

(c) ns², np⁶           ✓

(d) ns², np⁵

24. Which element exists in liquid form at room temperature?

(a) Ba

(b) Br                    ✓

(c) Be

(d) B

25. Number of elements placed in 6^th period is:

(a) 18

(b) 8

(c) 32              ✓

(d) 14

26. Point out the number of electrons in the valence shells of halogens:

(a) 6

(b) 5

(c) 7              ✓

(d) 8

27. Electronegativity of oxygen is:

(a) 2.5

(b) 3.0

(c) 3.4                 ✓

(d) 4.0

28. Which one is the smallest among the following?

(a) Na

(b) F                   ✓

(c) O

(d) N

29. The radius of carbon atom is:

(a) 154 pm

(b) 77 pm         ✓

(c) 68 pm

(d) 70 pm

30. Elements of group I and group II have valence electrons in:

(a) s-subshell        ✓

(b) p-subshell

(c) d-subshell

(d) f-subshell

31. In 1860 correct atomic mass of elements were determined by:

(a) Cannizzaro        ✓

(b) Newlands

(c) Mosely

(d) Mendeleev

32. How many elements were arranged by Mendeleev in order of increasing atomic masses?

(a) 60

(b) 61

(c) 62

(d) 63 ✓

33. How many periods are there in the modern periodic table?

(a) 6

(b) 7                  ✓

(c) 8

(d) 9

34. 32 elements are present in which period of periodic table?

(a) 5^th

(b) 6^th           ✓

(c) 4^th

(d) 8^th

35. Mark the incorrect statement.

(a) 1^st period contains two elements

(b) 2^nd period contains eight elements

(c) 3^rd period contains 18 elements

(d) 7^th period contains 23 elements only ✓

36. In which atom outermost electrons are highly shielded?

(a) F

(b) Cl

(c) Br

(d) I ✓

37. Which of the following does not belong to 1^st group?

(a) Hydrogen

(b) Sodium

(c) Rubidium

(d) Calcium ✓

38. Which one of the following halogen has highest electronegativity?

(a) F                    ✓

(b) I

(c) Cr

(d) CI

39. Point out among the following which has highest value of electron affinity

(a) F             ✓

(b) CI

(c) Br

(d) I

40. Lanthanide series start after:

(a) La               ✓

(b) Ba

(c) Ra

(d) Cs

41. ns² is the general electronic configuration of:

(a) Boron family

(b) Nitrogen family

(c) Alkali metals

(d) Alkaline earth metals ✓

42. For Boron Z = 5, it belongs to which block:

(a) s

(b) p                 ✓

(c) d

(d) f