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Q. No.The set that contains atomic numbers of only transition elements is:
1. 21, 32, 53, 64
2. 9, 17, 34, 38
3. 21, 25, 42, 72
4. 37, 42, 50, 64
Subtopic: Â Modern Periodic Table & Periodicity |
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According to the periodic law of elements, the variation in properties of elements is related to their:
1. Atomic masses
2. Nuclear mass
3. Atomic numbers
4. Nuclear neutron-proton number ratio
Subtopic: Â Modern Periodic Table & Periodicity |
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Which of the following is a metalloid?
1. ln (Indium)
2. Te (Tellurium)
3. Pb (Lead)
4. Bi (Bismuth)
1. ln (Indium)
2. Te (Tellurium)
3. Pb (Lead)
4. Bi (Bismuth)
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Subtopic: Â Modern Periodic Table & Periodicity |
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Mark the correct increasing order of the metallic character of the given below elements:
Si, K, Mg, and Be
Si, K, Mg, and Be
| 1. | Si < Mg < Be < K | 2. | Be < Mg < Si < K |
| 3. | Si < Be < Mg < K | 4. | K < Mg < Si < Be |
Subtopic: Â Modern Periodic Table & Periodicity |
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Choose the option containing all isoelectronic species:
1. \(N^{3-}, O^{2-}, F, Na \)
2. \(\mathrm{S}^{-2}, \mathrm{Cl}^{-}, \mathrm{K}^{+}, \mathrm{Ca}^{2+} \)
3. \(\mathrm{NH}_3, \mathrm{CH}_4, \mathrm{PF}_5, \mathrm{Na}^{+} \)
4. \(\mathrm{Ne}, \mathrm{Na}^{+}, \mathrm{F}, \mathrm{N}^{3-} \)
1. \(N^{3-}, O^{2-}, F, Na \)
2. \(\mathrm{S}^{-2}, \mathrm{Cl}^{-}, \mathrm{K}^{+}, \mathrm{Ca}^{2+} \)
3. \(\mathrm{NH}_3, \mathrm{CH}_4, \mathrm{PF}_5, \mathrm{Na}^{+} \)
4. \(\mathrm{Ne}, \mathrm{Na}^{+}, \mathrm{F}, \mathrm{N}^{3-} \)
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