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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
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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with an explanation.
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i. What is the atomic number of this element?
ii. What is the valency of this element?
iii. What is the group of this element?
iv. To which period does this element belong?
v. With which of the following elements would this element resemble?
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What is the atomic number of this element?
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To which period does this element belong?
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Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
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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 |
Match the columns.
| Column A | Column B |
| 1) Alkaline earth metals | a) Group 18 |
| 2) Alkali metals | b) Group 17 |
| 3) Halogen | c) Group 2 |
| 4) Noble gas | d) Group 1 |
| e) Group 14 |
Write the name.
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- What is the atomic number of element A?
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- From which block the elements X and Y are?
- Determine the electronic configuration and valency of these elements.
