Chemistry Periodic Classification Of Elements & Periodicity Online Test

Malik TahirLast Updated: October 14, 2025

Important Periodic Classification Of Elements & Periodicity Question and Answer

Total Questions:	107
Time Allowed:	60 Minutes
Total Marks:	107
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Chemistry Periodic Classification Of Elements & Periodicity Practice Test Online With Explanation

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Page 1 of 5

Chemistry

1. Which of the following elements is most electronegative?

Nitrogen

Fluorine

Chlorine

Oxygen

2. Hydrogen resembles with carbon because of having

Similar physical state

Remarkable reducing properties

Same number of electrons in the valence shell

Homovalent (show same valency)

3. Higher value of electron affinity means

The reason is unknown

Atom may form di-positive ion

Atom will lose electron easily

Atom will gain electron easily

4. Which has largest first ionization energy?

5. The electronegativity of Sodium is

0.9

1.2

1.5

1.8

6. Inner transition elements are called

Rare earth metals

Lanthanides

All

Actinides

7. The valence shell electronic stricture of an element is ns²np⁵. The element will belong to the group of

Inert metals

Noble gases

Halogens

Alkali metals

8. Which one has least ionization Potential?

9. An element has electronic configuration IS2, 2S2, 2P2 with which group does this element belong to

IVA

Zero

Group IIA

VIIA

10. The element with highest first ionization energy is

11. Mark the correct statement

Melting points of halogens decrease down the group

Melting point of halogens first increase and then decrease down the group

Melting points of halogens remains the same throughout the group

Melting points of halogens increases down the group

12. Which one of the following is not a periodic property?

MP of elements

Ionization energy of elements

Coordination number of icons

BP of elements

13. The atoms of same element having same atomic number bit different mass number are called

Isomers

Isotopes

Isobars

Isotropes

14. White enamel of our teeth is

CaU₂

Ca₃ (PO4)₂

CaF₂

CaBr₂

15. The defects in the Mendeleev’s Periodic table is/are

Similar elements like Cu and Zn have been placed in different groups

K (at, wt.39.1) has been placed after argon (at, wt. 39.9)

In spite of their different properties, alkali metals and coinage metals have been grouped together

All above statements are correct

16. An element having low value of ionization energy and low value of electron affinity is likely to belong to

Group IB

Group VIII

Group VII A

Group IA

17. Which of the following elements is/are not liquid at 30°C?

18. Metals form halides which are

Ionic

Polymeric

Covalent

All

19. Elements with similar chemical properties appear in 1 the

Same family

Right upper corner

Same period

p block elements

20. Which of the following pair of atomic numbers represents s-block element?

9, 17

6, 12

7, 15

3, 20

21. IN the light of Mendeleev’s periodic law,. the properties of elements are periodic function of their

Atomic masses

Density

Atomic numbers

Volume

22. An element has electronic configuration 1s2 2s2 2p2. It belongs to

Group IV-A

Group II-A

Group VII-A

Group VI-A

23. Which among the following elements have lowest value of IE₁?

24. Number of elements present in the fifth period of periodic table is

25. Which one is more acidic?

Cl₂O₇

As₂O₃

Al₂O₃

Wa₂O₂

Page 2 of 5

26. Mark the correct statement

Na⁺ is smaller than Na atom

Cl⁺ is smaller than Cl atom

Cl⁺ (ions are equal in size)

Na⁺ is larger than Na atom

27. Modern periodic table has been divided in _________ blocks.

28. Non-metals usually form ________ oxides.

Amphoteric

Neutral

Acidic

All of the above

29. The property which increases up to the middle of the period and then decreases is

m.P and B.P

Atomic radii

Atomic volume

Ionization energy

30. Which statement is correct?

Hydrogen resembles in properties with IA, IVA and VIIA elements

Hydrogen resembles in properties with IIA, IIIA and VIIIA elements

Hydrogen resembles in properties with IIIA, IVA and VA elements

Hydrogen resembles in properties with IIA, IVA and VIA elements

31. In modern periodic table all the elements are arranged in ascending order of

Atomic number

Valency

Valence electrons

Atomic mass

32. Modern periodic table has been divided in __________ block.

33. Which of the p-block elements are not representative elements?

Group-18 elements (VIII-A)

Alkali metals (I-A)

Group-14 elements (IV-A)

Halogens (VII-A)

34. Which of the following pairs are chemically dissimilar?

Na and K

Ba and Sr

Zr and Hf

Ca and Zn

35. Chemically the most similar pair of elements is

Ti, Zr

Cu, S

Na, Al

Zr, Hf

36. Elements whose atoms have two outermost shells incomplete are called

s – block elements

p – block elements

f – block elements

d – block elements

37. Mark the Dobereiner triad

Cl, Br, I

Zn, Cr, Na

Ne, Ar, K

B, C, Si

38. The elements which behave as metalloid is:

Rb & Cs

Br & I

Pt & I

AI & Zn

39. Metallic characters of alkali metals

No regular trend

Increase down the group

Decrease down the group

Remain same

40. The alkali metal which is liquid at 15°C is

None

41. Which of the pairs belongs to the same group of periodic table?

Elements with atomic number 17 and 38

Elements with atomic number 11 and 33

Elements with atomic numbers 20 and 40

Elements with atomic number 17 and 53

42. The atomic radii decreases by increasing atomic number in

Elements from Li to Ne

Alkali metal

Alkaline earth metal

Halogens

43. Shielding effect across the period

Increases

Remains constant

Decreases

Cannot be predicted

44. Inner transition elements are called

All

Lanthanides

Actinides

Rare earth metals

45. Among the following elements which one has the highest value of first ionization potential?

Barium

Cesium

Argon

Oxygen

46. Best position of hydrogen in the periodic table is mainly due to

Similar electronic configuration

All

Both are not found in free state

Both are electropositive

47. The property which increases up to group IV-A then decreases onwards

Atomic volume

Melting & boiling points

Atomic radii

Ionization energy

48. The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

Electron affinity

Ionization energy

Electronegativity

Valency

49. Elements whose outer electronic configuration vary from ns²np¹ to ns¹np⁶ constitute

d – block elements

f – block elements

s – block elements

p – block elements

50. Which one is the strongest reducing agent?

Page 3 of 5

51. The number of elements in fourth period of periodic table is

52. Which element was not known when Mendeleev proposed his classification?

Germanium

Hydrogen

Copper

Sodium

53. Californium is the member of

Actinide series

Lanthanide series

Alkaline earth metals

Alkali metals

54. Among the elements given below, the one with highest electro positivity is

55. Which discovery caused a revision in periodic law as predicted by Mendeleev?

Location of nucleus by Rutherford

Atomic number by Moseley

Henry Becquerel’s natural radioactivity

x-rays by Roentgen

56. Mark the elements that belong to same period:

Li, Na, K

Cr, In, Pb

H, He, F

Ca, Cr, Zn

57. Periodic table provides a basic framework to study elements with respect to their

Physical properties

All

Properties of their compounds

Chemical properties

58. Which one is not an ionic hydride?

NaH

CsH

LiH

59. Best position of hydrogen in the periodic table is above I.A Group which is mainly due to

Both are electropositive

Similar outer most shell electronic configuration

Both form ionic compounds

All

60. Which of the following possess maximum hydration power?

Na⁺

K⁺

Ca⁺²

Mg⁺²

61. Keeping in view the size of atoms, which order in correct one

Ba > Mg

Lu > Ce

Cl > I

B > Ga

62. Among O, C, F, Cl, Br, the correct order of increasing radii is

F Cl Br O C

C O F Cl Br

F C O Cl Br

F O C Cl Br

63. Which of the following set consist of all coinage metals?

Cu, Ag, Au

Cu, Fe, Au

Cu, Hg, Au

Ag, Au, Hg

64. The element with atomic number 26 will be found in group

65. The formation of the oxide ion O²¯ (g) requires first a exothermic and then and endothermic step – as shown below:
O(g) +e – → O
∆Ho = – 142 k3 mol – 1
O– (g) + e– →O2 –(g)
∆Ho = + ∆H° = + 844 kJ mol¯¹
This is because:

Oxygen is more electronegative

O– ion will tend to resist the addition of another electron

Oxygen has high electron affinity

O– ion has comparatively larger size oxygen atom

66. The discovery of which of the following group of elements give below to the Newland’s law of octaves?

Inert gases

Actinides

Alkaline earths

Rare earths

67. Which of the following has highest electropositive character?

68. The element with atomic number 14 belongs to

4th period

2nd period

3rd period

5th period

69. Which of the following groups may contain a metalloid?

IIA

VIA

IIIA

70. The 14 elements have been placed in VI period and II group of periodic table. These are called

Alkali metals

Alkaline earth metals

Inert gases

Rare earth metals

71. Which of the following metal requires radiation of highest frequency to cause emission of electrons?

72. The highly electronegativity atom is

73. Variable valency is generally exhibited by

None of these

Normal elements

Transition elements

Metallic elements

74. Mark the correct statement

All lanthanides are present in the same group

All the noble gases are present in the same period

All halogens are present in the same period

All the alkali metals are present in the same period

75. The element with atomic number 55 belongs to which block of the periodic table

d-block

f-block

s-block

p-block

Page 4 of 5

76. The attempt of classification of elements by plotting the atomic weight of elements against their volumes was made

Bohr

Dobereiner

Lother Meyer

Newlands

77. Which of the following does not reflect the periodicity of elements?

Ionization potential

Neutron/proton ration

Bonding behavior

Electronegativity

78. Of the given alkali metals, the one with smallest size is

79. The valency of noble gases, in general, is

Zero

Three

Two

One

80. Seventh period contains ____________ normal elements

81. Which order of ionization energy is correct?

Mg > A1

Si > P

Mg < A1

Both b & c

82. Oxidation state of an atom represent

Number of electrons gained

Apparent charge I compound

Its vacancies

Number of electrons lost

83. Which set of elements is listed in order of increasing ionization energy?

Cl < Sb < P < As < S

Sb < As < S < P < Cl

As < Cl < P < S < Sb

Sb < As < Cl < S < P

84. Which of these Period 3 element has lowest electronegativity?

85. Mark the correct statement

The ionization energy of calcium is lower than that of barium

The ionization energy of calcium is than that of beryllium

The ionization energy of calcium is lower than that of strontium

The ionization energy of calcium is higher than that of magnesium

86. Elements were classified into groups of three called as trades by

Dobereiner

Lother Meyer

New lands

Rutherford

87. The atomic radii decrease by increasing atomic number in

Alkali metal

Alkaline earth metal

Elements from Li to Ne

Halogens

88. Which of the following represents element s in order of increasing atomic size?

Li, Na, K

I, Br, CI

C, N, O

Na, Mg, C

89. The longest period in the modern periodic table is

5th

7th

6th

2nd and 3rd both

90. Many of the properties of elements and its compounds can be predicted from the position of element in the periodic table. Which property cannot be predicted?

The number of isotopes it has

The formula of its oxides

Acidic or basic nature of oxides

Charge on its ions

91. The periodic table consists of

7 horizontal and 18 vertical series

8 horizontal and 7 vertical series

8 horizontal and 18 vertical series

7 horizontal and 7 vertical series

92. Addition of 2nd e to uni-negative ion is always

Exothermic

Endothermic

Data is insufficient

A or b

93. The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

Na < K < Rb < Mg

Mg < Na < K < Rb

Mg < K < Na < Rb

Mg < Na < Rb < K

94. Which of the following ion is stable in aqueous solution?

All are stable

H-

H+

Cl-

95. Oxidation state of an atomic represent

No of e lost

No of e gained or/lost

No of e gained

None

96. Which of the following statements is most appropriate about effective nuclear charge? It depends upon?

Both the nuclear charge and the shielding constant

The shielding constant

The charge on the nucleus

The atomic number

97. Which of these Period 3 elements have highest electronegativity?

98. Which element was not known when Mendeleev proposed his classification?

Hydrogen

Germanium

Copper

99. Which of the following has greatest tendency lose electron?

100. Magnesium keeps on burning in

N₂O

N₂

N₂ as well as Co₂

Co₂

Page 5 of 5

101. Elements in the same vertical group of the periodic table have same

Number of valence electrons

Atomic volume

Atomic number

Atomic mass

102. Which of the pair of metalloids?

F and U

As and Sb

Na and K

Cu and Au

103. The electronegativity of Si is

1.5

1.2

2.1

1.8

104. Noble gases are named so because they are

Inert

Zero group element

All

Having completely filled valence shell

105. Which of the following groups of period table has entirely metals?

VII

106. The electron affinity values (in kJ mol¯¹) of three halogens X, Y and Z are respectively – 349, -333 and -325. Then X, Y and Z respectively are:

Cl, Br and F

F, Cl and Br

Cl, F and Br

Br, Cl and F

107. Alkali metals in each period have

Highest electronegativity

Highest IE

Lowest IE

Smallest size

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Malik TahirLast Updated: October 14, 2025

Chemistry Periodic Classification Of Elements & Periodicity Online Test

Important Periodic Classification Of Elements & Periodicity Question and Answer

Chemistry Periodic Classification Of Elements & Periodicity Practice Test Online With Explanation

Chemistry

Malik Tahir

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