- 1(current)
Q. No.The basic theme of the periodic table is:
| 1. | To classify the elements in a period according to their properties. |
| 2. | To classify the elements in a group according to their ionization enthalpy. |
| 3. | To classify the elements in periods and groups according to their properties. |
| 4. | To classify the elements in periods and groups according to their lustre. |
Subtopic: Evolution of Periodic Table |
87%
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Property used by Mendeleev to classify the elements was:
1. Brightness
2. Atomic weight or mass
3. Number of isotopes
4. Lustre
Subtopic: Evolution of Periodic Table |
95%
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The basic difference between Mendeleev’s Periodic Law (A) and Modern Periodic Law (B) is:
| 1. | A is based on atomic weights while B is based on atomic numbers. |
| 2. | B is based on atomic weights while A is based on atomic numbers. |
| 3. | A is based on the number of isotopes while B is based on atomic numbers. |
| 4. | A is based on physical properties while B is based on chemical properties. |
Subtopic: Evolution of Periodic Table |
91%
From NCERT
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- 1(current)
Q. No.
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