GENERAL KNOWLEDGE

Detailed explanation-1: -The number of protons in the nucleus of an atom is its atomic number (Z). This is the defining trait of an element: Its value determines the identity of the atom. For example, any atom that contains six protons is the element carbon and has the atomic number 6, regardless of how many neutrons or electrons it may have.

Detailed explanation-2: -An element is uniquely identified only by number of protons it contains the number of neutrons and electrons can vary without identity of element changing.

Detailed explanation-3: -The atomic number of an element is determined by the number of protons in it, and it is used to differentiate one element from another. The mass number of an element is determined by the number of protons and neutrons combined.

Detailed explanation-4: -An element and its location in the periodic table is determined according to the number of protons in the nucleus.