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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 atomic numbers of two elements 'X' and 'Y' having electronic configuration 2, 8, 2 and 2, 8, 6 respectively.
What happens to the metallic character of the elements as we go down in a group of the periodic table?
How does the valency of elements vary in going down a group of the periodic table?
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
Which of the following element does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
An element has 2 electrons in its N shell.
State the name assigned to this group.
An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :
 |
1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 2 | A | B | C | D | |||||
| 3 | E | F |
On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why ?
(v) Write the common name for the family to which the elements D and F belong.
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
Name or state following with reference to the elements of the first three periods of the periodic table.
A metalloid in period 2 and in period 3.
