Question

what is atomic mass and what is atomic no. ?​

Answer 1

Answer:

The mass number (symbol A, from the German word Atomgewicht (atomic weight),[1] also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It determines the atomic mass of atoms. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus: {\displaystyle N=A-Z} {\displaystyle N=A-Z}.[2]

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Answer 2

Answer:

• Atomic Number uniquely identifies a chemical element.
• In an uncharged atom, the atomic number is also equal to the number of electrons.
• The sum of the atomic number Z and the number of neutons N, gives the mass number A of an atom.

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