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The serial or ordinal number of an element in Mendeleev’s periodic table was recognized as …………. 

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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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(D) proton number

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