The serial or ordinal number of an element in Mendeleev’s periodic t

1.	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
Answer» Correct option is : (D) proton number The serial number of an element in Mendeleev's periodic table was recognized as proton number. (D) proton number

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

Answer»

Correct option is : (D) proton number

The serial number of an element in Mendeleev's periodic table was recognized as proton number.

(D) proton number