The modern periodic table has been evolved through the early attempts

1.	The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all 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.

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all 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.

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