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प्रश्न
Moving left to right in the second period, the number of valence electrons _____.
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उत्तर
Moving left to right in the second period, the number of valence electrons increases from 1 to 8.
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संबंधित प्रश्न
Write the number of vertical columns in the modern periodic table. What are these columns called?
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
In the following set of element, one element does not belong to the set. Select this element and state why it does not belong:
Calcium, Magnesium, Sodium, Beryllium
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Select the correct answer
Number of shells in potassium are
What is meant by a group in the periodic table?
