The modern periodic table has been evolved through the early attempts
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.
Answer
Dobereiner Periodic Table
- Advantage: To predict the atomic mass of middle element in each triad
- Limitation: Dobereiner could identify only three triads
Newland Periodic table
- Advantage: Every eighth element had properties similar to that of first/ co-related the properties of elements with their atomic mass.
- Limitation: It was only applicable up to Calcium / only 56 elements and no future element
Mendeleev’s Periodic Table
- Advantage: Elements with similar properties could be grouped / He predicted the existence of new elements that had not been discovered at that time.
- Limitation: No fixed position for hydrogen/ position of isotopes/ Atomic masses do not increase in a regular manner.
- Exam Year: 2018
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