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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
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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 metal requires radiation of highest frequency to cause emission of electrons?

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

Copper

Germanium

Sodium

Hydrogen

3. 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 has comparatively larger size oxygen atom

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

Oxygen has high electron affinity

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

IIA

IIIA

VIA

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

All

Physical properties

Chemical properties

Properties of their compounds

6. Which one is more acidic?

Cl₂O₇

Wa₂O₂

As₂O₃

Al₂O₃

7. Which statement is correct?

Hydrogen resembles in properties with IIA, IIIA and VIIIA elements

Hydrogen resembles in properties with IA, IVA and VIIA elements

Hydrogen resembles in properties with IIA, IVA and VIA elements

Hydrogen resembles in properties with IIIA, IVA and VA elements

8. Which of the following elements is most electronegative?

Chlorine

Fluorine

Nitrogen

Oxygen

9. 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:

Br, Cl and F

Cl, Br and F

Cl, F and Br

F, Cl and Br

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

H+

All are stable

Cl-

H-

11. Elements with similar chemical properties appear in 1 the

Same family

p block elements

Right upper corner

Same period

12. The periodic table consists of

7 horizontal and 7 vertical series

8 horizontal and 7 vertical series

8 horizontal and 18 vertical series

7 horizontal and 18 vertical series

13. Mark the correct statement

Melting points of halogens remains the same throughout the group

Melting points of halogens decrease down the group

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

Melting points of halogens increases down the group

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

Alkaline earth metals

Inert gases

Alkali metals

Rare earth metals

15. Mark the correct statement

Na⁺ is larger than Na atom

Cl⁺ is smaller than Cl atom

Na⁺ is smaller than Na atom

Cl⁺ (ions are equal in size)

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

Volume

Atomic masses

Density

Atomic numbers

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

Isotropes

Isomers

Isobars

Isotopes

18. Metallic characters of alkali metals

Increase down the group

No regular trend

Remain same

Decrease down the group

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

Similar outer most shell electronic configuration

All

Both are electropositive

Both form ionic compounds

20. Which one is the strongest reducing agent?

21. 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

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

Dobereiner

Rutherford

New lands

Lother Meyer

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

f-block

d-block

s-block

p-block

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

Hydrogen

Germanium

Copper

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

Atomic mass

Number of valence electrons

Atomic number

Atomic volume

Page 2 of 5

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

Cesium

Barium

Oxygen

Argon

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

Atomic volume

Atomic radii

Ionization energy

m.P and B.P

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

29. 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 number 17 and 38

Elements with atomic numbers 20 and 40

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

The charge on the nucleus

The shielding constant

The atomic number

Both the nuclear charge and the shielding constant

31. Hydrogen resembles with carbon because of having

Remarkable reducing properties

Same number of electrons in the valence shell

Similar physical state

Homovalent (show same valency)

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

33. Mark the correct statement

The ionization energy of calcium is than that of beryllium

The ionization energy of calcium is higher than that of magnesium

The ionization energy of calcium is lower than that of strontium

The ionization energy of calcium is lower than that of barium

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

As < Cl < P < S < Sb

Sb < As < S < P < Cl

Sb < As < Cl < S < P

Cl < Sb < P < As < S

35. Mark the correct statement

All halogens are present in the same period

All the noble gases are present in the same period

All lanthanides are present in the same group

All the alkali metals are present in the same period

36. Which of the pair of metalloids?

F and U

Na and K

As and Sb

Cu and Au

37. Variable valency is generally exhibited by

Metallic elements

None of these

Normal elements

Transition elements

38. The element with highest first ionization energy is

39. Which has largest first ionization energy?

40. Which of the following possess maximum hydration power?

Mg⁺²

K⁺

Na⁺

Ca⁺²

41. Which one has least ionization Potential?

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

43. 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

Ionization energy

Valency

Electronegativity

Electron affinity

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

Group-18 elements (VIII-A)

Halogens (VII-A)

Group-14 elements (IV-A)

Alkali metals (I-A)

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

46. The longest period in the modern periodic table is

5th

6th

2nd and 3rd both

7th

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

Alkaline earths

Inert gases

Rare earths

Actinides

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

49. Oxidation state of an atom represent

Number of electrons lost

Its vacancies

Apparent charge I compound

Number of electrons gained

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

d – block elements

p – block elements

f – block elements

s – block elements

Page 3 of 5

51. Chemically the most similar pair of elements is

Na, Al

Ti, Zr

Zr, Hf

Cu, S

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

Two

One

Three

Zero

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

d – block elements

s – block elements

f – block elements

p – block elements

54. Which of the following has highest electropositive character?

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

All above statements are correct

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

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

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

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

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

Atomic mass

Valence electrons

Valency

Atomic number

58. Which one is not an ionic hydride?

NaH

CsH

LiH

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

Henry Becquerel’s natural radioactivity

x-rays by Roentgen

Atomic number by Moseley

Location of nucleus by Rutherford

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

I, Br, CI

Na, Mg, C

C, N, O

Li, Na, K

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

62. Non-metals usually form ________ oxides.

Acidic

Neutral

All of the above

Amphoteric

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

Cu, Hg, Au

Cu, Fe, Au

Cu, Ag, Au

Ag, Au, Hg

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

VII

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

Dobereiner

Lother Meyer

Bohr

Newlands

66. Noble gases are named so because they are

Inert

All

Zero group element

Having completely filled valence shell

67. Californium is the member of

Alkaline earth metals

Lanthanide series

Alkali metals

Actinide series

68. Mark the Dobereiner triad

Ne, Ar, K

Cl, Br, I

B, C, Si

Zn, Cr, Na

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

F Cl Br O C

F C O Cl Br

F O C Cl Br

C O F Cl Br

70. Inner transition elements are called

Actinides

Rare earth metals

Lanthanides

All

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

Inert metals

Halogens

Alkali metals

Noble gases

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

None

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

Cl > I

Ba > Mg

Lu > Ce

B > Ga

74. Which order of ionization energy is correct?

Mg > A1

Mg < A1

Si > P

Both b & c

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

A or b

Exothermic

Endothermic

Data is insufficient

Page 4 of 5

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

77. Oxidation state of an atomic represent

No of e lost

None

No of e gained

No of e gained or/lost

78. Which of the following pairs are chemically dissimilar?

Na and K

Zr and Hf

Ca and Zn

Ba and Sr

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

6, 12

3, 20

7, 15

9, 17

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

Ionization energy

Melting & boiling points

Atomic radii

Atomic volume

81. The atomic radii decrease by increasing atomic number in

Alkali metal

Halogens

Elements from Li to Ne

Alkaline earth metal

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

83. Metals form halides which are

Covalent

Ionic

Polymeric

All

84. Shielding effect across the period

Decreases

Remains constant

Increases

Cannot be predicted

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

IVA

VIIA

Zero

Group IIA

86. The element with atomic number 14 belongs to

4th period

3rd period

2nd period

5th period

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

Mg < Na < K < Rb

Mg < K < Na < Rb

Na < K < Rb < Mg

Mg < Na < Rb < K

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

Bonding behavior

Neutron/proton ration

Electronegativity

Ionization potential

89. Higher value of electron affinity means

Atom will gain electron easily

Atom will lose electron easily

Atom may form di-positive ion

The reason is unknown

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

Coordination number of icons

MP of elements

Ionization energy of elements

BP of elements

91. The electronegativity of Sodium is

0.9

1.8

1.2

1.5

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

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

94. The highly electronegativity atom is

95. Seventh period contains ____________ normal elements

96. White enamel of our teeth is

CaBr₂

CaF₂

CaU₂

Ca₃ (PO4)₂

97. The electronegativity of Si is

2.1

1.2

1.5

1.8

98. Mark the elements that belong to same period:

H, He, F

Cr, In, Pb

Ca, Cr, Zn

Li, Na, K

99. Alkali metals in each period have

Highest IE

Lowest IE

Highest electronegativity

Smallest size

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

Page 5 of 5

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

Both are electropositive

Similar electronic configuration

Both are not found in free state

All

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

Group II-A

Group VI-A

Group VII-A

Group IV-A

103. 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?

Acidic or basic nature of oxides

The formula of its oxides

The number of isotopes it has

Charge on its ions

104. The elements which behave as metalloid is:

Pt & I

Br & I

AI & Zn

Rb & Cs

105. Inner transition elements are called

All

Actinides

Lanthanides

Rare earth metals

106. The atomic radii decreases by increasing atomic number in

Alkaline earth metal

Elements from Li to Ne

Halogens

Alkali metal

107. Magnesium keeps on burning in

N₂ as well as Co₂

Co₂

N₂O

N₂

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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

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