The serial or ordinal number of an element in Mendeleev’s periodic table was recognized as ………….
The serial or ordinal number of an element in Mendeleev’s periodic table was recognized as ………….
(A) neutron number
(B) valency
(C) principal quantum number
(D) proton number
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Correct option is : (D) proton number
The serial number of an element in Mendeleev's periodic table was recognized as proton number.
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