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Given below are some elements of the Modern Periodic Table:
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1
|
457
|
March 30, 2019
|
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The positions of three elements A, B and C in the periodic table are indicated below:
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1
|
1372
|
March 30, 2019
|
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The atomic number of an element is 16, predict:
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1
|
654
|
March 30, 2019
|
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Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:
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1
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1115
|
March 30, 2019
|
|
(a) What are ‘groups’ and ‘periods’ in the ‘periodic table’?
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1
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495
|
March 30, 2019
|
|
1. What is meant by periodicity in properties of elements with reference to the periodic table?
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1
|
564
|
March 30, 2019
|
|
The position of three elements A, B and C in the periodic table are shown below:
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1
|
3014
|
March 30, 2019
|
|
The position of three elements A, B and C in the periodic table is show below:
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1
|
707
|
March 30, 2019
|
|
Name any two elements of group one and write their electronic configuration
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1
|
498
|
March 30, 2019
|
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Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom
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1
|
523
|
March 30, 2019
|
|
Na, Mg and A1 are the elements of the same period of Modern Periodic Table having one, two and three valence electrons, respectively
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|
1
|
440
|
March 30, 2019
|
|
Write the number of groups and period in the modern periodic table. Mention the criteria of placing elements in the
|
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1
|
1450
|
March 30, 2019
|
|
Na, Mg, and A1 are the elements having one, two and three valence electrons respectively. Which of these elements
|
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1
|
482
|
March 30, 2019
|
|
Why do all the elements of the (a) Same group have similar properties, (b) Same period have different properties?
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1
|
981
|
March 30, 2019
|
|
An element ‘M’ has atomic number 11
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|
1
|
447
|
March 30, 2019
|
|
State Mandeleev’s periodic law. Write two achievements of Mendeleev’s periodic table
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|
1
|
1471
|
March 30, 2019
|
|
Arrange the following elements from greatest to least tendency to accept an electron
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0
|
7790
|
March 23, 2018
|
|
Which can be found on the periodic table- elements, compounds, or mixtures?
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0
|
291
|
March 20, 2018
|
|
In the following table, six elements A, B, C, D, E and F of the modern periqdic table with atomic numbers 3 to 18 are given:
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0
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1138
|
March 18, 2018
|
|
Atoms of seven elements A, B, C, D, E, F and G have a different number of electronic shells
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0
|
2669
|
March 18, 2018
|
|
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells
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|
0
|
20819
|
March 18, 2018
|
|
The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis
|
|
0
|
643
|
March 18, 2018
|
|
How would the tendency to lose electrons change as you go from left to right across a period?
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0
|
1123
|
March 18, 2018
|
|
How does the atomic radius change as you go from left to right in a period?
|
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0
|
839
|
March 18, 2018
|
|
The atomic number of an element ‘X’ is 19. Write its electronic configuration
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|
0
|
3456
|
March 18, 2018
|
|
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
|
3788
|
March 18, 2018
|
|
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound
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|
0
|
932
|
March 18, 2018
|
|
An element X which is a yellow solid at room temperature shows catenation and allotropy X forms two oxides
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0
|
749
|
March 18, 2018
|
|
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium
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|
0
|
2599
|
March 18, 2018
|
|
Atomic number of a few elements are given below: 10, 20, 7, 14
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|
0
|
8691
|
March 18, 2018
|
