Question

Define atomic number, mass number and isotones.​

Answer 1

Answer:

Atomic no : the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

Mass no : the total number of protons and neutrons in a nucleus.

Isotones : are atoms of different elements having same member of neutrons but different atomic number and atomic mass.

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Answer 2

Answer:

αtσmic ηυmβεr: Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

mαss ηυmβεr: The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.

isσtσηεs: Isotones are atomic species that share the same number of neutrons, and differ in the number of protons. Examples of isotones include carbon-12, nitrogen-13 and oxygen-14. These atoms all have six neutrons and six, seven and eight protons respectively.