neet centre 2021
Dobereiner arranged elements as
1. groups
2. periods
3. triads
4. All the above
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Triads means
1. Small groups of Three elements
2. Small groups of Four elements
3. Small groups of Five elements
4. Small groups of Six elements
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The first classification of elements is attempted by
1. Dobereiner
2. Mendeleff
3. Mosley
4. John A.R. Newlands
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According Mendeleef periodic law the proper ties of elements are the periodic functions of their ……
1. Atomic numbers
2. Atomic weights
3. Atomic sizes
4. Atomic volumes
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