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प्रश्न
Find the period in which these elements can be placed.
4Be, 17Cl, 2He, 13Al
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उत्तर
- 4Be- Electronic configuration is (2, 2). It is placed in period 2.
- 17Cl- Electronic configuration is (2, 8, 7). It is placed in period 3.
- 2He- Electronic configuration is (2). It is placed in period 1.
- 13Al- Electronic configuration is (2, 8, 3). It is placed in period 3.
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संबंधित प्रश्न
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
11Na, 15P, 17Cl, 14Si, 12Mg Which of these has largest atoms?
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.
19K, 3Li, 11Na, 4Be Which of these atoms has smallest atomic radius?
Write the scientific reason.
The third period contains only eight elements even though the electron capacity of the third shell is 18
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Which among the following elements would lose an electron easily?
Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
Match the columns.
| Column A | Column B |
| 1) s -block | a) Lanthanides and actinides |
| 2) p -block | b) Group 3 to 12 |
| 3) d -block | c) Group 1, 2 |
| 4) f -block | d) Group 13 to 18 |
| e) Zero group |
Match the columns.
| Column A | Column B |
| Electronic configuration |
Valency |
| 1) 2, 2 | a) 1 |
| 2) 2, 8, 1 | b) 2 |
| 3) 2, 5 | c) 3 |
| d) 5 |
Write the name.
The group of elements having electronic configuration 2, 2.
The valency of the elements in group 2 is 1.
Beryllium and calcium are alkaline earth metals.
Write an Explanation.
Group
Distinguish between:
Group - Period
Identify periods of elements and blocks of elements from given electronic configuration?
- 2, 8, 2
- 2, 8, 7
- 2, 1
Observe the given chart and answer the questions given below.
| Element | A | B | C | D |
| Electronic configuration | 2, 1 | 2, 8 | 2, 8, 1 | 2, 8, 8 |
- Which elements are in the same row?
- Which elements have the same column?
- Which elements are in the 18th column?
- Which element is more reactive among A and C?
- Which of the following elements A or B will form compounds?
What is the electronic configuration of K19?
