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Question

Who developed a long form of the periodic table?

A
Lothar Meyer
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B
Neil Bohr
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C
Mandeleev
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D
Mosely
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Solution

The correct option is A Mosely
LotharMeyer: He developed table contain only 28 elements, which are classified on the basis of valence,
Mendeleev: Arranged elements by atomic mass in his periodic table.
Moseley: He developed the periodic table which we used today, on the basis of atomic number. This table is called as a long form of the periodic table.
Thus, the correct answer is option D.

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