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प्रश्न
Write a scientific reason.
Boron and oxygen elements are placed in the second period in periodic table.
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उत्तर
- Electronic configuration of boron is (2, 3). The electronic configuration of oxygen is (2, 6).
- Both boron and oxygen have electrons in the two shells, K and L.
- The elements with the same number of shells occupied by electrons belong to the same period.
Hence, boron and oxygen elements are placed in the second period in the periodic table.
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संबंधित प्रश्न
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b. What is the group of this element?
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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?
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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 |
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Write the name.
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| Electronic configuration | 2, 1 | 2, 8 | 2, 8, 1 | 2, 8, 8 |
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