how an element with same atomic number can have different mass number
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Answer:
Those elements that have the same atomic number but a different mass number are referred to as isotopes. Isotopes occur due to the presence of a different number of neutrons in elements having the same atomic number as mass number is the sum of the number of neutrons and protons.
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Answer:
Atomic Number
The number of protons presents in the nucleus of an atom is called the atomic number. It is generally represented by Z. It has been established that the charge of a proton is equal but opposite to that of an electron. Since an atom is electrically neutral and neutrons carry no electrical charge, the number of electrons and protons in a neutral atom is the same. This implies that the atomic number is equal to the number of protons or the number of electrons in an atom. As we know that elements tend to lose or gain electrons during many chemical reactions, the number of protons is conventionally used to represent the atomic number of an element. Hydrogen has the atomic number of one as it has only one proton in its atom.