GENERAL KNOWLEDGE

Detailed explanation-1: -The identity of an element is defined by Z, the number of protons in the nucleus of an atom of the element, which is different for each element.

Detailed explanation-2: -An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons.

Detailed explanation-3: -The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Detailed explanation-4: -The number of protons in the nucleus of an atom determines an element’s atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.