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.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

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

Please wait...

Page 1 of 5

Chemistry

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

Group IIA

Zero

IVA

VIIA

2. Which of the pair of metalloids?

Na and K

Cu and Au

F and U

As and Sb

3. Which of the following pairs are chemically dissimilar?

Ba and Sr

Na and K

Zr and Hf

Ca and Zn

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

None

5. Which one is more acidic?

Al₂O₃

As₂O₃

Wa₂O₂

Cl₂O₇

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

Atomic mass

Atomic number

Number of valence electrons

Atomic volume

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

d-block

f-block

p-block

s-block

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

Both form ionic compounds

Both are electropositive

All

Similar outer most shell electronic configuration

9. Which order of ionization energy is correct?

Mg < A1

Both b & c

Si > P

Mg > A1

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

Halogens

Noble gases

Inert metals

Alkali metals

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

Neutron/proton ration

Electronegativity

Ionization potential

Bonding behavior

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

Sodium

Germanium

Hydrogen

Copper

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

14. Which of the following elements is most electronegative?

Nitrogen

Chlorine

Oxygen

Fluorine

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

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

New lands

Lother Meyer

Dobereiner

Rutherford

17. 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

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

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

9, 17

6, 12

7, 15

3, 20

20. Which of the following possess maximum hydration power?

K⁺

Mg⁺²

Ca⁺²

Na⁺

21. 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

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

Group-14 elements (IV-A)

Halogens (VII-A)

Alkali metals (I-A)

Group-18 elements (VIII-A)

23. The electronegativity of Si is

1.8

1.5

1.2

2.1

24. Magnesium keeps on burning in

N₂O

N₂

N₂ as well as Co₂

Co₂

25. Which one is not an ionic hydride?

LiH

NaH

CsH

Page 2 of 5

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

F Cl Br O C

F O C Cl Br

F C O Cl Br

C O F Cl Br

27. Oxidation state of an atomic represent

No of e gained or/lost

None

No of e gained

No of e lost

28. Alkali metals in each period have

Highest IE

Lowest IE

Smallest size

Highest electronegativity

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

Chemical properties

All

Properties of their compounds

Physical properties

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

MP of elements

BP of elements

Coordination number of icons

Ionization energy of elements

31. Mark the correct statement

Melting points of halogens decrease down the group

Melting points of halogens increases 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

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

Cesium

Oxygen

Argon

Barium

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

As < Cl < P < S < Sb

Cl < Sb < P < As < S

Sb < As < Cl < S < P

Sb < As < S < P < Cl

34. Seventh period contains ____________ normal elements

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

36. 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

37. Non-metals usually form ________ oxides.

All of the above

Neutral

Amphoteric

Acidic

38. Which statement is correct?

Hydrogen resembles in properties with IIIA, IVA and VA elements

Hydrogen resembles in properties with IIA, IIIA and VIIIA elements

Hydrogen resembles in properties with IIA, IVA and VIA elements

Hydrogen resembles in properties with IA, IVA and VIIA elements

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

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

Valency

Atomic number

Valence electrons

Atomic mass

41. 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

42. Higher value of electron affinity means

Atom will gain electron easily

The reason is unknown

Atom may form di-positive ion

Atom will lose electron easily

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

All

Both are not found in free state

Similar electronic configuration

Both are electropositive

44. 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 has high electron affinity

O– ion has comparatively larger size oxygen atom

Oxygen is more electronegative

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

45. Hydrogen resembles with carbon because of having

Same number of electrons in the valence shell

Homovalent (show same valency)

Similar physical state

Remarkable reducing properties

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

Atomic radii

m.P and B.P

Atomic volume

Ionization energy

47. Mark the Dobereiner triad

Ne, Ar, K

Zn, Cr, Na

Cl, Br, I

B, C, Si

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

Alkali metals

Rare earth metals

Alkaline earth metals

Inert gases

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

f – block elements

d – block elements

p – block elements

s – block elements

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

Two

Zero

Three

One

Page 3 of 5

51. Which one has least ionization Potential?

52. Which one is the strongest reducing agent?

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

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

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

VII

56. Metals form halides which are

Polymeric

Ionic

Covalent

All

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

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

Cu, Hg, Au

Ag, Au, Hg

Cu, Fe, Au

Cu, Ag, Au

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

Group VII A

Group IB

Group IA

Group VIII

60. 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

61. Which has largest first ionization energy?

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

Copper

Germanium

Hydrogen

63. The longest period in the modern periodic table is

2nd and 3rd both

7th

5th

6th

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

Group VI-A

Group VII-A

Group IV-A

Group II-A

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

Elements with atomic number 17 and 53

Elements with atomic number 11 and 33

Elements with atomic numbers 20 and 40

Elements with atomic number 17 and 38

66. Oxidation state of an atom represent

Number of electrons lost

Apparent charge I compound

Its vacancies

Number of electrons gained

67. The electronegativity of Sodium is

0.9

1.8

1.5

1.2

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

IIA

IIIA

VIA

69. Mark the correct statement

Na⁺ is larger than Na atom

Na⁺ is smaller than Na atom

Cl⁺ is smaller than Cl atom

Cl⁺ (ions are equal in size)

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

Melting & boiling points

Ionization energy

Atomic volume

Atomic radii

71. Variable valency is generally exhibited by

Metallic elements

Normal elements

None of these

Transition elements

72. Mark the elements that belong to same period:

Li, Na, K

Ca, Cr, Zn

Cr, In, Pb

H, He, F

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

74. Which of the following has highest electropositive character?

75. Chemically the most similar pair of elements is

Ti, Zr

Zr, Hf

Na, Al

Cu, S

Page 4 of 5

76. 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

77. Metallic characters of alkali metals

Remain same

Decrease down the group

Increase down the group

No regular trend

78. White enamel of our teeth is

CaBr₂

CaU₂

CaF₂

Ca₃ (PO4)₂

79. The atomic radii decreases by increasing atomic number in

Alkali metal

Elements from Li to Ne

Halogens

Alkaline earth metal

80. Shielding effect across the period

Decreases

Cannot be predicted

Increases

Remains constant

81. Elements with similar chemical properties appear in 1 the

Same period

Right upper corner

Same family

p block elements

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

83. The elements which behave as metalloid is:

Pt & I

Rb & Cs

Br & I

AI & Zn

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

x-rays by Roentgen

Location of nucleus by Rutherford

Atomic number by Moseley

Henry Becquerel’s natural radioactivity

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

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

Both the nuclear charge and the shielding constant

The atomic number

The shielding constant

The charge on the nucleus

87. Inner transition elements are called

Rare earth metals

All

Actinides

Lanthanides

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

All are stable

Cl-

H+

H-

89. The highly electronegativity atom is

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

d – block elements

f – block elements

s – block elements

p – block elements

91. Inner transition elements are called

Lanthanides

Rare earth metals

Actinides

All

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

Density

Atomic numbers

Volume

Atomic masses

93. Noble gases are named so because they are

Zero group element

All

Having completely filled valence shell

Inert

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

Isotopes

Isobars

Isotropes

Isomers

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

Newlands

Lother Meyer

Bohr

Dobereiner

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

Lu > Ce

Cl > I

B > Ga

Ba > Mg

97. The periodic table consists of

7 horizontal and 18 vertical series

7 horizontal and 7 vertical series

8 horizontal and 7 vertical series

8 horizontal and 18 vertical series

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

Actinides

Alkaline earths

Inert gases

Rare earths

99. The element with atomic number 14 belongs to

4th period

3rd period

5th period

2nd period

100. The atomic radii decrease by increasing atomic number in

Alkali metal

Elements from Li to Ne

Alkaline earth metal

Halogens

Page 5 of 5

101. Mark the correct statement

The ionization energy of calcium is than that of beryllium

The ionization energy of calcium is lower than that of barium

The ionization energy of calcium is higher than that of magnesium

The ionization energy of calcium is lower than that of strontium

102. Mark the correct statement

All the noble gases are present in the same period

All halogens are present in the same period

All lanthanides are present in the same group

All the alkali metals are present in the same period

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

104. Californium is the member of

Alkali metals

Lanthanide series

Actinide series

Alkaline earth metals

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

Exothermic

Data is insufficient

Endothermic

A or b

106. The element with highest first ionization energy is

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

Can't find what you're looking for? Search below:

Latest Updates

Basic Concepts of Chemistry Online Mcqs Test
Chemistry Carboxylic Acid Online Mcqs Test
Chemistry Gases Test 2 Online Mcqs
Chemistry Group VA and VIA Elements Online Mcqs Test
Chemistry Industrial Chemistry Online Mcqs Test
Chemistry Chemical Bonding Online Mcqs Test
Chemistry Aldehydes and Ketones Online Mcqs Test
Chemistry Gases Test 3 Online Mcqs

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

One Comment

Leave a Reply Cancel reply