|
An element placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide
|
|
0
|
3852
|
March 18, 2018
|
|
How do you calculate the valency of an element from its electronic configuration?
|
|
0
|
18465
|
March 18, 2018
|
|
Calcium is an element with atomic number 20. Stating reason answer each of the following questions
|
|
0
|
9358
|
March 18, 2018
|
|
Taking the example of an element of atomic number 16, explain how the electronic configuration
|
|
0
|
1657
|
March 18, 2018
|
|
Two elements with symbol X (atomic no. 16) and Y (atomic no. 12) are placed in the III period of the Modern Periodic Table
|
|
0
|
1163
|
March 18, 2018
|
|
Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why?
|
|
0
|
11633
|
March 18, 2018
|
|
Consider the following elements: Li, Cl, Br, Na, K, I
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0
|
1649
|
March 18, 2018
|
|
Four elements P, Q, R and S belong to the third period of the Modern Periodic table
|
|
0
|
2328
|
March 18, 2018
|
|
The atomic numbers of nitrogen, oxygen and fluorine are 7, 8 and 9 respectively
|
|
0
|
2412
|
March 18, 2018
|
|
The elements of the second period of the Periodic Table are given below:
|
|
0
|
1833
|
March 18, 2018
|
|
The atomic radii of first group elements of the Periodic Table are as follows:
|
|
0
|
1423
|
March 18, 2018
|
|
The following table shows the position of six elements A, B, C, D, E and F in the Periodic Table
|
|
0
|
3349
|
March 18, 2018
|
|
The atomic number of an element ‘X’ is 20. Determine the position of the element ‘X’ in the periodic table
|
|
0
|
4581
|
March 18, 2018
|
|
Properties of the elements are given below. Where would you locate the following elements in the Periodic Table?
|
|
0
|
3553
|
March 18, 2018
|
|
Identify the elements with the following property and arrange them in increasing order of their reactivity
|
|
0
|
797
|
March 18, 2018
|
|
The position of three elements A, B and C in the Periodic Table is shown below:
|
|
0
|
2355
|
March 18, 2018
|
|
Two elements ‘P’ and ‘Q’ belong to the same period of the Modern Periodic Table
|
|
0
|
10597
|
March 18, 2018
|
|
Na, Mg and AI are the elements of the same period of Modern Periodic Table
|
|
0
|
688
|
March 18, 2018
|
|
Nitrogen (atomic no. 7) and phosphorous (atomic no. 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements in terms of K, L, M, N shell. Predict whether these are metallic or non-metallic. Ans
|
|
0
|
2020
|
March 18, 2018
|
|
Given below are some elements of the Modern Periodic Table
|
|
0
|
850
|
March 18, 2018
|
|
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells
|
|
0
|
1016
|
March 18, 2018
|
|
Write the number of periods the Modern Periodic Table has
|
|
0
|
697
|
March 18, 2018
|
|
Name any two elements of group one and write their electronic configurations
|
|
0
|
695
|
March 18, 2018
|
|
From the following elements: Select the element having one electron in the outermost shell
|
|
0
|
1314
|
March 18, 2018
|
|
How many groups and periods are there in the Modern Periodic Table?
|
|
0
|
1261
|
March 18, 2018
|
|
Write the main aim of classifying elements. Name the basic property of elements used
|
|
0
|
2859
|
March 18, 2018
|
|
Explain why sodium is more reactive than lithium
|
|
0
|
4032
|
March 18, 2018
|
|
Why do we classify elements
|
|
0
|
786
|
March 18, 2018
|
|
Which group of elements could be placed in Mendeleev’s Periodic Table without disturbing the original order? Give reason
|
|
0
|
660
|
March 18, 2018
|
|
Arrange the following elements in the increasing order of their metallic character Mg, Ca, K, Ge, Ga
|
|
0
|
2769
|
March 18, 2018
|