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Write the formula of the product formed when the element A
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|
4
|
2831
|
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
|
2596
|
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
|
4753
|
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
|
7735
|
September 22, 2016
|
|
An element X which is a yellow solid at room temperature shows catenation and allotropy
|
|
1
|
9097
|
September 22, 2016
|
|
An element X (atomic number 17) reacts with element Y (atomic number 20) to form a divalent halide
|
|
1
|
24835
|
September 22, 2016
|
|
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
|
14849
|
September 22, 2016
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|
Identify the elements with the following property and arrange them in increasing order of their reactivity:
|
|
1
|
3080
|
September 22, 2016
|
|
Arrange the following elements in the increasing order of their metallic character:
|
|
0
|
2136
|
September 22, 2016
|
|
Identify and name the metals out of the following elements whose electronic configurations are given below:
|
|
1
|
911
|
September 22, 2016
|
|
Arrange the following elements in increasing order of their atomic radii:
|
|
1
|
4412
|
September 22, 2016
|
|
Compare the radii of two species X and Y. Give reasons for your answer
|
|
1
|
1961
|
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
|
1325
|
September 22, 2016
|
|
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev
|
|
0
|
1496
|
September 22, 2016
|
|
"Hydrogen occupies a unique position in Modem Periodic Table". Justify the statement
|
|
0
|
1570
|
September 22, 2016
|
|
In Mendeleev's Periodic Table the elements were arranged in the increasing order of their atomic masses
|
|
1
|
1844
|
September 22, 2016
|
|
Can the following groups of elements be classified as Dobereiner's triad?
|
|
1
|
9758
|
September 22, 2016
|
|
Elements have been arranged in the following sequence on the basis of their increasing atomic masses:
|
|
1
|
5359
|
September 22, 2016
|
|
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively
|
|
1
|
7618
|
September 22, 2016
|
|
Atomic radii of the elements of the second period are given below:
|
|
1
|
2585
|
September 22, 2016
|
|
Study the variation in the atomic radii of first group elements given below and arrange them in an increasing order
|
|
1
|
4821
|
September 22, 2016
|
|
The atomic radii of the element of second period are given below:
|
|
1
|
10762
|
September 22, 2016
|
|
State the Modern Periodic Law:
|
|
1
|
2314
|
September 22, 2016
|
|
Why do we classify elements?
|
|
1
|
17576
|
September 22, 2016
|
|
Discuss any two achievements of Modem periodic table
|
|
1
|
8379
|
September 22, 2016
|
|
From the part of a Periodic Table, answer the following questions:
|
|
1
|
7261
|
September 22, 2016
|
|
A part of the Periodic Table has been shown below:
|
|
1
|
2687
|
September 22, 2016
|
|
Given below are some elements of the modem periodic table:
|
|
1
|
945
|
September 22, 2016
|
|
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide
|
|
1
|
2059
|
September 22, 2016
|
|
The electronic configuration of an element 'X' is 2,8,8,2
|
|
1
|
5978
|
September 22, 2016
|