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In Mendeleev's Periodic Table the elements were arranged in the increasing order of their atomic masses
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1
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1961
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September 22, 2016
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Can the following groups of elements be classified as Dobereiner's triad?
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1
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9937
|
September 22, 2016
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Elements have been arranged in the following sequence on the basis of their increasing atomic masses:
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1
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5525
|
September 22, 2016
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The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively
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1
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8023
|
September 22, 2016
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Atomic radii of the elements of the second period are given below:
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1
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2836
|
September 22, 2016
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Study the variation in the atomic radii of first group elements given below and arrange them in an increasing order
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1
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5155
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September 22, 2016
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The atomic radii of the element of second period are given below:
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1
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11245
|
September 22, 2016
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State the Modern Periodic Law:
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1
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2493
|
September 22, 2016
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Why do we classify elements?
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1
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17760
|
September 22, 2016
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Discuss any two achievements of Modem periodic table
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1
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8817
|
September 22, 2016
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From the part of a Periodic Table, answer the following questions:
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1
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7455
|
September 22, 2016
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A part of the Periodic Table has been shown below:
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1
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3023
|
September 22, 2016
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Given below are some elements of the modem periodic table:
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1
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1064
|
September 22, 2016
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An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide
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1
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2169
|
September 22, 2016
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The electronic configuration of an element 'X' is 2,8,8,2
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1
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6098
|
September 22, 2016
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The atomic number of an element is 17
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1
|
3799
|
September 22, 2016
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Four elements P, Q, R and S have atomic numbers 12,13,14 and 15 respectively
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1
|
13606
|
September 22, 2016
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State the Modern Periodic Law
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1
|
1191
|
September 22, 2016
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Consider the table given below and answer the following questions:
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1
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3292
|
September 22, 2016
|
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Three elements A, B and C have atomic number 7,8 and 9 respectively
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1
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6034
|
September 22, 2016
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The elements of the second period along with their atomic number in parentheses are given below:
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1
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2783
|
September 22, 2016
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How and why does the size of an atom vary on moving from left to right in a period?
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1
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2023
|
September 22, 2016
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What is meant by periodicity in properties of elements with reference to the periodic table?
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1
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9446
|
September 22, 2016
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Table given below shows a part of the Periodic Table:
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1
|
4360
|
September 22, 2016
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Explain how the tendency of metallic character changes from left to right across the period
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0
|
1103
|
September 22, 2016
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The electronic configuration of 4 elements A, B, C and D is as given under:
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1
|
2028
|
September 22, 2016
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The atomic number of K and Ca is 19 and 20 respectively and they belong to the same period
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1
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3365
|
September 22, 2016
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Identify the element that have two completely filled shells and the number of valence electrons in each are as:
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1
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1671
|
September 22, 2016
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How does electropositivity of elements gets affected as we move:
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1
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2562
|
September 22, 2016
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Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modem periodic table:
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1
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12513
|
September 22, 2016
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