CHAPTER 5 : Periodic Classification of Elements

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GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR DISTRICT

Name of the Student : *

School : *

District : *

1) Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table : *

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(a) The elements become less metallic in nature.

(b) The number of valence electrons increases.

(d) The oxides become more acidic

2) Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as : *

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(a) Na

(b) Mg

(d) Si

3) What property do all elements in the same column of the Periodic Table as fluorine have in common? *

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(a) Electronegativity

(b) Atomic size

(d) Valency

4) Which element has two shells, both of which are completely filled with electrons? *

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(a) Neon

(b) Argon

(d) Helium

5) Which element has the electronic configuration 2, 8, 2? *

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(a) Na

(b) Ar

(d) Mg

6) Which element has a total of three shells, with four electrons in its valence shell? *

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(a) C

(b) Si

(d) O

7) Which element has a total of two shells, with three electrons in its valence shell? *

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(a) Carbon

(b) Beryllium

(d) Nitrogen

8) Which element has twice as many electrons in its second shell as in its first shell? *

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(a) Carbon

(b) Oxygen

(d) Nitrogen

9) An atom has electronic configuration 2, 8, 7. What is the atomic number of this element? *

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(a) 2

(b) 8

(d) 17

10) An atom has electronic configuration 2, 8, 7. What is the valency of this element? *

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(a) 2

(b) 8

(d) 1

11) An atom has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?(Atomic numbers are given in parentheses.) *

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(a) N(7)

(b) F(9)

(d) Ar(18)

12) The criteria used by Mendeléev in creating his Periodic Table : *

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(a) Fundamental property of elements

(b) Atomic mass of the elements

(d) All the above

13) Up to which element, the Law of Octaves was found to be applicable : *

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(a) Oxygen

(b) Calcium

(d) Potassium

14) According to Mendeleev's ′ Periodic Law, the elements were arranged in the periodic table in the order of : *

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(a) increasing atomic number

(b) decreasing atomic number

(d) decreasing atomic masses

15) In Mendeleev ′ ’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later: *

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(a) Germanium

(b) Chlorine

(d) Silicon

16) Which of the following statements about the Modern Periodic Table is correct: *

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(a) It has 18 horizontal rows known as Periods

(b) It has 7 vertical columns known as Periods

(d) It has 7 horizontal rows known as Groups

17) Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 12 respectively belong to the same period? *

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(a) A, B, C

(b) B, C, D

(d) B, D, E

18) The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group? *

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(a) A and B

(b) B and D

(d) D and E

19) Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table? *

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(a) Group 8

(b) Group 2

(d) Group 10

20) An element which is an essential constituent of all organic compounds belongs to : *

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(a) group 1

(b) group 14

(d) group 16

21) Which of the following is the outermost shell for elements of period 2? *

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(a) K shell

(b) L shell

(d) N shell

22) Which one of the following elements exhibit maximum number of valence electrons? *

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(a) Na

(b) Al

(d) P

23) Which of the following gives the correct increasing order of the atomic radii of O, F and N ? *

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(a) O < F < N

(b) N < F < O

(d) F < O < N

24) Which among the following elements has the largest atomic radii? *

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(a) Na

(b) Mg

(d) Ca

25) Which of the following elements does not lose an electron easily? *

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(a) Na

(b) F

(d) Al

26) What type of oxide would Eka– aluminium form? *

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(a) E O3

(b) E3 O2

(d) EO

27) Three elements B, Si and Ge are : *

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(a) metals

(b) non-metals

(d) metal, non-metal and metalloid respectively

28) Which one of the following depict the correct representation of atomic radius(r) of an atom? *

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(a)

(b)

(c)

(d)

29) Which one of the following does not increase while moving down the group of the periodic table? *

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(a) Atomic radius

(b) Metallic character

(d) Number of shells in an element

30) On moving from left to right in a period in the periodic table, the size of the atom : *

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(a) increases

(b) decreases

(d) first increases and then decreases

A Part of the Modern Periodic Table and 5 elements is given in the following Questions and they are not the symbols of the elements.

31) Identify the alkali metal (s) from the given table : *

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a & d

32) Identify the noble gas : *

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33) Identify the halogen : *

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34) Where do you place the element 'f' with electronic configuration 2,8,2 *

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(a) 2nd period, 2nd group

(b) 3rd period, 2nd group

(d) 3rd period, 16th group

35) Number of valence electrons in the element 'b' : *

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(a) 2

(b) 3

(d) 13

36) Valency of the element 'e' : *

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(a) 7

(b) 17

(d) 1

37) Number of shell(s) in the atom of element 'd' : *

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(a) 1

(b) 2

(d) 4

38) The element with highest metallic property : *

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(a) a

(b) e

(d) d

39) Similarity in the elements 'a' and 'd' : *

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(a) atomic size

(b) valence electrons

(d) metallic property

40) Element 'e' is a : *

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(a) metal

(b) non-metal

(d) noble gas

Dobereiner's Triads :

Dobereiner's Law of Triads : When the 3 elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.

Newlands's Table :

Newland's Law of Octaves : When the elements are arranged in the increasing order of their atomic masses, every eighth element had properties similar to that of the first as in the notes of octaves.

Mendeleev's Periodic Table :

Mendeleev's Periodic Law : The properties of elements are the periodic function of their atomic masses.

Modern Periodic Table :

Modern Periodic Law : Properties of elements are a periodic function of their atomic number.

TRENDS IN THE MODERN PERIODIC TABLE :

GOPALA RAO C K

GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR DISTRICT 563137

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