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Write the formula of the product formed when the element A
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|
4
|
2982
|
December 18, 2017
|
|
Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at "Periodic Law"?
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0
|
2709
|
September 22, 2016
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Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order ? Give reason
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|
0
|
4883
|
September 22, 2016
|
|
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K
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1
|
8032
|
September 22, 2016
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|
An element X which is a yellow solid at room temperature shows catenation and allotropy
|
|
1
|
9291
|
September 22, 2016
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|
An element X (atomic number 17) reacts with element Y (atomic number 20) to form a divalent halide
|
|
1
|
25108
|
September 22, 2016
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|
An element is placed in 2nd Group and 3rd Period of the Periodic Table, bums in presence of oxygen to form a basic oxide
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1
|
14981
|
September 22, 2016
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Identify the elements with the following property and arrange them in increasing order of their reactivity:
|
|
1
|
3219
|
September 22, 2016
|
|
Arrange the following elements in the increasing order of their metallic character:
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|
0
|
2252
|
September 22, 2016
|
|
Identify and name the metals out of the following elements whose electronic configurations are given below:
|
|
1
|
1033
|
September 22, 2016
|
|
Arrange the following elements in increasing order of their atomic radii:
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|
1
|
4575
|
September 22, 2016
|
|
Compare the radii of two species X and Y. Give reasons for your answer
|
|
1
|
2120
|
September 22, 2016
|
|
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
|
|
0
|
1416
|
September 22, 2016
|
|
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev
|
|
0
|
1589
|
September 22, 2016
|
|
"Hydrogen occupies a unique position in Modem Periodic Table". Justify the statement
|
|
0
|
1683
|
September 22, 2016
|
|
In Mendeleev's Periodic Table the elements were arranged in the increasing order of their atomic masses
|
|
1
|
1967
|
September 22, 2016
|
|
Can the following groups of elements be classified as Dobereiner's triad?
|
|
1
|
9944
|
September 22, 2016
|
|
Elements have been arranged in the following sequence on the basis of their increasing atomic masses:
|
|
1
|
5529
|
September 22, 2016
|
|
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively
|
|
1
|
8031
|
September 22, 2016
|
|
Atomic radii of the elements of the second period are given below:
|
|
1
|
2842
|
September 22, 2016
|
|
Study the variation in the atomic radii of first group elements given below and arrange them in an increasing order
|
|
1
|
5164
|
September 22, 2016
|
|
The atomic radii of the element of second period are given below:
|
|
1
|
11262
|
September 22, 2016
|
|
State the Modern Periodic Law:
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|
1
|
2497
|
September 22, 2016
|
|
Why do we classify elements?
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|
1
|
17774
|
September 22, 2016
|
|
Discuss any two achievements of Modem periodic table
|
|
1
|
8831
|
September 22, 2016
|
|
From the part of a Periodic Table, answer the following questions:
|
|
1
|
7469
|
September 22, 2016
|
|
A part of the Periodic Table has been shown below:
|
|
1
|
3043
|
September 22, 2016
|
|
Given below are some elements of the modem periodic table:
|
|
1
|
1071
|
September 22, 2016
|
|
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide
|
|
1
|
2174
|
September 22, 2016
|
|
The electronic configuration of an element 'X' is 2,8,8,2
|
|
1
|
6103
|
September 22, 2016
|