| 556. | Configuration of 18 electrons (e⁻) in third principal quantum level in s=2, p=8 and d will be |
| a. | 18 |
| b. | 10 |
| c. | 12 |
| d. | 11 |
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Answer: (b).10
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| 557. | Elements with more than 57 electrons require |
| a. | f-orbital |
| b. | d-orbital |
| c. | p-orbital |
| d. | s-orbital |
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Answer: (a).f-orbital
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| 558. | The concept of Avogadro's number was given by |
| a. | Newland |
| b. | Mendeleev |
| c. | Amedeo Avogadro |
| d. | Al- Razi |
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Answer: (c).Amedeo Avogadro
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| 559. | Avogadro's number is the collection of particles |
| a. | 6.02 x 10²³ |
| b. | 2.06 x10²³ |
| c. | 0.26 x 10²³ |
| d. | None of above |
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Answer: (a).6.02 x 10²³
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| 560. | Noble gases have complete |
| a. | Duplet |
| b. | Octet |
| c. | Shells |
| d. | Sub-shells |
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Answer: (b).Octet
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