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# The atoms of same element having same atomic number but different mass are called:A.Atomic numberB.Mass numberC.Isotopes D.Isobar

Last updated date: 15th Sep 2024
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Hint: Isotopes: The elements which have the same atomic number but different atomic mass, are known as isotopes.
Isobars: The elements which have the same atomic mass but different atomic number, are known as isobars.

First of all let us talk about elements, atoms, mass number and atomic number.
Atoms: It is the smallest unit of an element. The elements are made of the same kind of atoms. In the atoms there are three particles: electrons, protons and neutrons.
Electrons: They are the negatively charged particle having negligible mass. They move in the atoms outside the nucleus in a fixed orbit.
Protons: They are positively charged particles. They have mass. They are present in the nucleus (a special room in the atoms were neutrons and protons are present).
Neutrons: They have no charge but they have mass. They are also present in the nucleus along with protons.
Gram molecule: It is defined as the number of grams of the substance i.e. the molecular mass of the substance.
Atomic mass: It is defined as the total number of protons and neutrons present in the nucleus of an atom. It is represented by symbol A.
Atomic number: It is defined as the number of protons in the nucleus of an atom. It is represented by symbol Z.
Isotopes: The elements which have the same atomic number but different atomic mass, are known as isotopes. For example: carbon$- 12$ and carbon$- 14$. In both the carbons the atomic number is the same i.e. six but they have different atomic mass i.e. carbon$- 12$ the mass is $12$ and for carbon$- 14$ the mass is $14$.
Isobars: The elements which have the same atomic mass but different atomic number, are known as isobars. For example: Argon and calcium. They both have atomic mass $40$ but atomic number of argon is $18$ and atomic number of calcium is $20$.

So, the correct answer is Option C.

Note:
Isotones: The elements which have the same number of neutrons, but different number of electrons and protons, are known as isotones. For example: boron$- 12$ and carbon$- 13$. They both have seven neutrons in their atoms.