Question

What number (Z or A) defines an element

Answer 1

Answer:

Explanation:

'Z' defines the atomic number of the element.

Atomic number:

              "The number of protons in the nucleus

               of the atom is called as its atomic number

               or proton number".

'A' defines the mass number of the element.

Mass number:

            "The sum of the number of electrons and

               number of neutrons in an atom is

              called as its mass number".

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Answer 2

Answer:

Explanation:

Z = Atomic number

A= Mass number