PROGRAMME LEARNING MATERIAL ON PERIODIC CLASSIFICATION OF

ELEMENTS

MADE BY-

SAKSHI SHAWID-

14162076B.ED- SCI & EDU

CONTENT ANALYSIS

Attempt

s of classification of element

s:

CONTENT OBJECTIVE•STUDENTS WILL BE ABLE TO DEFINE PERIODIC CLASSIFICATION OF ELEMENTS

•STUDENTS WILL BE ABLE TO UNDERSTAND THE NEED OF CLASSIFICATION OF ELEMENTS.

•STUDENTS WILL BE ABLE TO ANALYSE THE DISCOVERIES & EARLY ATTEMPTS OF CLASSIFYING ELEMNTS.

•STUDENTS WILL BE ABLE TO DEDUCE THE MERITS & DEMERITS OF SEVERAL CLASSICAL ATTEMPTS OF CLASSIFICATION OF ELEMENTS.

•STUDENTS WILL BE ABLE TO ANALYSE THE IMPORTANCE OF MODERN PERIODIC TABLE OVER OTHER CLASSICAL ATTEMPTS OF CLASSIFICATION.

•STUDENTS WILL BE ABLE TO DESIGN MODERN PERIODIC TABLE BASED ON PROPERTIES OF ELEMENTS.

•STUDENTS WILL BE ABLE TO SOLVE PROBLEMS ON PERIODIC CLASSIFICATION OF PROBLEMS.

DEAR STUDENT, READ THE WRITTEN DOCUMENT CAREFULLY ; TO UNVEIL THE SECRET ANSWERS TO QUESTIONS LYING WITHIN….

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Q.1 Q.2 Q.3 Q.4 Q.5

Q1- Dobereiners’s Triads was given by Johann Wolfgang Dobereiners's who was –

(a) Swedish botanist

(b) German chemist

(c) European scientist

(d) French chemist.

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Q.2- He arranged the elements in order of their :

(a) Increasing atomic mass.

(b) Decreasing atomic mass.

(c) Increasing atomic number.

(d) Decreasing atomic number.

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Q.3- Identify which group of elements is satisfying Dobereiners's Triads

1.) Lithium (Li) 7.0 2.Hydrogen (H)1.0 Sodium (Na) 23.0 Sodium (Na) 23.0 Potassium (K) 39.0 Carbon (C) 12.0

(a) 1.(b) 1 & 2 both.(c) 2.(d) none of the above.

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Q.4- Dobereiners's Law became obsolete because :

(a) Dobereiners's could find only three such triads (group of three elements) and he could not even put all the elements known at that time in his triads.

(b) The rules of Dobereiners's triads could not be applied to the elements which had very low or high atomic mass.

(c) Due to the advancement of techniques of measuring atomic mass more correctly .

(d) All of the above.

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Q.5-Identify the Dobereiners’s Triads in the table below:

(a) 1,2&3. (b) 1 & 3. (c) 3. (d) 2.

Elements and their Atomic Mass

1. Lithium (Li) 7.0 Sodium (Na) 23.0 Potassium (K) 39.0

2. Nitrogen (N) 14.0 Calcium (Ca) 40.0 Barium (Ba) 137.0

3. Chlorine (Cl) 35.0 Bromine (Br) 80.0 Iodine (I) 127.0

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DEAR STUDENT, READ THE WRITTEN DOCUMENT CAREFULLY ; TO UNVEIL THE SECRET ANSWERS TO QUESTIONS LYING WITHIN….

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Q.1 Q.2 Q.3 Q.4 Q.5

Q.1- In Mendeleev's periodic table Elements are arranged in the periodic table in the order of :

(a) Decreasing atomic size.

(b) Decreasing atomic number.

(c) Increasing relative atomic masses.

(d) Increasing relative atomic number.

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Q.2- The law of Newlands’ Law of Octaves depicts that :

(a) Elements are arranged in the periodic table in the increasing order of their relative atomic masses.

(b) Groups from I to VII are meant for normal elements and group VIII is for transition elements.

(c) Any given element will exhibit analogous behavior to the eighth element following it in the table.

(d) All of the above.

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Q.3-The limitation of Newland’s law of octave is that :

(a) Newlands’ Octaves could be valid up to calcium only; as beyond calcium, elements do not obey the rules of Octaves.Newlands’ Octaves was valid for lighter elements only.

(b) Every eighth element has similar physical and chemical properties when they were arranged in increasing order of their relative masses.

(c) The arrangement of elements in Newlands’ Octave resembles the musical notes. In musical notes, every eighth note produces similar sound.

(d) None of the above.

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Q.4- Fill in the blanks: Mendeleev arranged all 1. elements; in the order of their 2. in a tabular form.

(a) 1. 73 ; 2. increasing atomic number.

(b) 1.63 ; 2.increasing relative atomic masses.

(c) 1.42 ; 2. decreasing atomic number.

(d) 1.53; 2. decreasing atomic size.

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Q.5- Limitation of Mendeleev’s periodic table was because of :

(a) Mendeleev left some blank spaces in his periodic table in order to place the elements having similar properties in the same group.

(b) Mendeleev predicted the discovery of some elements and named them as eka-boron, eka-aluminium and eka-silicon.

(c) Position of Hydrogen, Position of Isotopes & Wrong Order of Elements

(d) Position of Noble gases which were discovered later:

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DEAR STUDENT, READ THE WRITTEN DOCUMENT CAREFULLY ; TO UNVEIL THE SECRET ANSWERS TO QUESTIONS LYING WITHIN….

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Q.1 Q.2 Q.3 Q.4 Q.5

Q.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.

(a) The elements become less metallic in nature.(b) The number of valence electrons increases.(c) The atoms lose their electrons more easily.(d) The oxides become more acidic. 

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Q.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

(a)Na(b)Mg(c) Al(d) Si

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Q.3- An atom has electronic configuration 2, 8, 7.What is the atomic number of this element?

(a) 27(b) 17(c) 13(d) 15

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Q.4- Which element has two shells, both of which are completely filled with electrons?

(a) Ne(b) Cl(c) Ar(d) H

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Q.5- Which element has the electronic configuration 2, 8, 2?

(a) Mn (b) Mg (c) Al (d) Bo

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FURTHER READING

VIDEO CLASS

PERIODIC TABLE SONG

ENCYCLOPEDIA

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