Who was Mendeleev? Describe Mendeleev's Period Table. What are the merits and
Demerits of Mendeleev's periodic table?
Answers
Answer:
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Explanation:
Merits of Mendeleev's Periodic Table:
⋅ Mendeleev was first to properly arrange and classify all elements and was able to explain the periodicity in their chemical properties.
⋅ Mendeleev left some gaps for undiscovered elements. He predicted that some elements would be discovered in future. He also predicted properties of those undiscovered elements.
Demerits of Mendeleev's Periodic Table:
⋅ Position of hydrogen was not justified.
⋅ Increasing order of atomic mass could not be maintained throughout the table.
⋅ There is no place for isotopes.
Answer:
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Explanation:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
