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प्रश्न
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
उत्तर
| Element in the second period | Li (3) | Be (4) | B (5) | C (6) | N (7) | O (8) | F (9) | Ne(10) |
| Electronic configuration | 2,1 | 2,2 | 2,3 | 2,4 | 2,5 | 2,6 | 2,7 | 2,8 |
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संबंधित प्रश्न
Which element has a total of two shells, with three electrons in its valence shell?
Fill in the blank in the following statement:
On going down in a group in the periodic table, the metallic character of elements ...............
How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?
In which part of a group would you separately expect the elements to have the largest atomic size?
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.
Calculate the valency of element X whose atomic number is 9.
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
The ion of which element will migrate towards the cathode during electrolysis?
Fill in the blank
Most electropositive elements belong to ______ group.
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
Write the electronic configuration of element 17T35.
- What is the group number of T?
- What is the period number of T?
- How many valence electrons are there in an atom of T?
- What is the valency of T?
- Is it a metal or non-metal?
- State number of protons and neutrons in T.
