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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 these Period 3 elements have highest electronegativity?

2. 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

3. 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, F and Br

Cl, Br and F

Br, Cl and F

F, Cl and Br

4. The element with atomic number 14 belongs to

3rd period

2nd period

5th period

4th period

5. Which of the following has highest electropositive character?

6. Metals form halides which are

All

Covalent

Ionic

Polymeric

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

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

s-block

p-block

d-block

f-block

9. Elements with similar chemical properties appear in 1 the

Same period

Same family

Right upper corner

p block elements

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

Density

Volume

Atomic numbers

Atomic masses

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

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

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

All above statements are correct

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

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

Alkali metals (I-A)

Halogens (VII-A)

Group-18 elements (VIII-A)

Group-14 elements (IV-A)

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

Group IV-A

Group VII-A

Group II-A

Group VI-A

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

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

Atomic mass

Number of valence electrons

Atomic volume

Atomic number

16. Mark the correct statement

All lanthanides are present in the same group

All the alkali metals are present in the same period

All the noble gases are present in the same period

All halogens are present in the same period

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

Hydrogen

Germanium

Copper

18. Oxidation state of an atom represent

Its vacancies

Number of electrons lost

Apparent charge I compound

Number of electrons gained

19. Which statement is correct?

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 IIIA, IVA and VA elements

Hydrogen resembles in properties with IA, IVA and VIIA elements

20. 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

Electronegativity

Ionization energy

Valency

Electron affinity

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

Barium

Argon

Cesium

Oxygen

22. The highly electronegativity atom is

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

One

Three

Zero

Two

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

25. Which one is not an ionic hydride?

LiH

CsH

NaH

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26. Variable valency is generally exhibited by

Metallic elements

Normal elements

None of these

Transition elements

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

28. Mark the correct statement

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

Melting points of halogens increases down the group

Melting points of halogens remains the same throughout the group

Melting points of halogens decrease down the group

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

IVA

VIIA

Group IIA

Zero

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

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

d – block elements

p – block elements

f – block elements

s – block elements

32. Noble gases are named so because they are

Zero group element

Having completely filled valence shell

Inert

All

33. Which one is more acidic?

Wa₂O₂

Al₂O₃

Cl₂O₇

As₂O₃

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

Na, Mg, C

I, Br, CI

C, N, O

Li, Na, K

35. Which of the pair of metalloids?

As and Sb

F and U

Cu and Au

Na and K

36. Mark the correct statement

The ionization energy of calcium is lower than that of barium

The ionization energy of calcium is lower than that of strontium

The ionization energy of calcium is than that of beryllium

The ionization energy of calcium is higher than that of magnesium

37. The atomic radii decrease by increasing atomic number in

Alkaline earth metal

Halogens

Elements from Li to Ne

Alkali metal

38. Shielding effect across the period

Decreases

Cannot be predicted

Increases

Remains constant

39. The periodic table consists of

8 horizontal and 18 vertical series

8 horizontal and 7 vertical series

7 horizontal and 18 vertical series

7 horizontal and 7 vertical series

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

F O C Cl Br

C O F Cl Br

F C O Cl Br

F Cl Br O C

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

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

Inert gases

Actinides

Rare earths

Alkaline earths

43. The electronegativity of Sodium is

1.5

1.8

0.9

1.2

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

All are stable

H+

Cl-

H-

45. Which one has least ionization Potential?

46. Hydrogen resembles with carbon because of having

Homovalent (show same valency)

Same number of electrons in the valence shell

Remarkable reducing properties

Similar physical state

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

f – block elements

s – block elements

d – block elements

p – block elements

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

Dobereiner

Rutherford

Lother Meyer

New lands

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

Noble gases

Inert metals

Halogens

Alkali metals

50. Mark the elements that belong to same period:

Li, Na, K

Ca, Cr, Zn

Cr, In, Pb

H, He, F

Page 3 of 5

51. Magnesium keeps on burning in

Co₂

N₂

N₂O

N₂ as well as Co₂

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

Elements with atomic number 17 and 53

Elements with atomic numbers 20 and 40

Elements with atomic number 17 and 38

Elements with atomic number 11 and 33

53. Inner transition elements are called

All

Actinides

Lanthanides

Rare earth metals

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

Sb < As < S < P < Cl

As < Cl < P < S < Sb

Cl < Sb < P < As < S

Sb < As < Cl < S < P

55. 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

Charge on its ions

The formula of its oxides

Acidic or basic nature of oxides

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

Similar outer most shell electronic configuration

Both form ionic compounds

Both are electropositive

All

57. 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

58. Which of the following pairs are chemically dissimilar?

Ca and Zn

Zr and Hf

Na and K

Ba and Sr

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

Ba > Mg

B > Ga

Cl > I

Lu > Ce

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

Atomic radii

Ionization energy

Atomic volume

Melting & boiling points

61. Inner transition elements are called

All

Lanthanides

Rare earth metals

Actinides

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

Atomic number

Valence electrons

Atomic mass

Valency

63. The element with highest first ionization energy is

64. Metallic characters of alkali metals

No regular trend

Remain same

Decrease down the group

Increase down the group

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

Isomers

Isobars

Isotopes

Isotropes

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

Group VIII

Group IA

Group VII A

Group IB

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

Bohr

Lother Meyer

Newlands

Dobereiner

68. Alkali metals in each period have

Highest electronegativity

Highest IE

Lowest IE

Smallest size

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

IIA

IIIA

VIA

70. Which order of ionization energy is correct?

Si > P

Both b & c

Mg > A1

Mg < A1

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

VII

72. The elements which behave as metalloid is:

Rb & Cs

AI & Zn

Br & I

Pt & I

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

Exothermic

Data is insufficient

A or b

Endothermic

74. The longest period in the modern periodic table is

2nd and 3rd both

7th

6th

5th

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

Page 4 of 5

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

77. Which one is the strongest reducing agent?

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

Cu, Fe, Au

Ag, Au, Hg

Cu, Hg, Au

Cu, Ag, Au

79. Californium is the member of

Actinide series

Alkaline earth metals

Lanthanide series

Alkali metals

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

81. Which of the following possess maximum hydration power?

K⁺

Ca⁺²

Na⁺

Mg⁺²

82. The atomic radii decreases by increasing atomic number in

Elements from Li to Ne

Halogens

Alkali metal

Alkaline earth metal

83. Oxidation state of an atomic represent

None

No of e gained or/lost

No of e lost

No of e gained

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

85. White enamel of our teeth is

Ca₃ (PO4)₂

CaF₂

CaU₂

CaBr₂

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

Physical properties

Properties of their compounds

All

Chemical properties

87. Seventh period contains ____________ normal elements

88. Mark the Dobereiner triad

Ne, Ar, K

B, C, Si

Cl, Br, I

Zn, Cr, Na

89. The electronegativity of Si is

2.1

1.8

1.2

1.5

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

Ionization potential

Electronegativity

Neutron/proton ration

Bonding behavior

91. Non-metals usually form ________ oxides.

Neutral

Acidic

Amphoteric

All of the above

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

7, 15

6, 12

3, 20

9, 17

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

The atomic number

Both the nuclear charge and the shielding constant

The charge on the nucleus

The shielding constant

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

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

Mg < Na < K < Rb

Mg < K < Na < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

96. 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

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

All

Both are electropositive

Similar electronic configuration

Both are not found in free state

98. Chemically the most similar pair of elements is

Na, Al

Cu, S

Zr, Hf

Ti, Zr

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

100. Which of the following elements is most electronegative?

Nitrogen

Fluorine

Chlorine

Oxygen

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101. Mark the correct statement

Na⁺ is smaller than Na atom

Na⁺ is larger than Na atom

Cl⁺ is smaller than Cl atom

Cl⁺ (ions are equal in size)

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

None

103. Higher value of electron affinity means

Atom will gain electron easily

Atom will lose electron easily

The reason is unknown

Atom may form di-positive ion

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

Rare earth metals

Alkali metals

Alkaline earth metals

Inert gases

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

Copper

Sodium

Hydrogen

Germanium

106. Which has largest first ionization energy?

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

Ionization energy of elements

Coordination number of icons

BP of elements

MP of elements

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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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