Question

read the following passage and answer the following question
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Answer 1

Explanation:

a) In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass.

He classified the elements resulting from their arrangement in the increasing order of their atomic numbers.

b) The modern periodic table is also known as the long form of the periodic table.

c) In the modern periodic table ,the elements are arranged in accordance with their atomic number.

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