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Question

Isotopes have different _______ number, because their nuclei contain different number of ________.


A

mass

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B

neutrons

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Solution

Isotopes: Isotopes are the atoms of the same elements that have same atomic number but different mass number. Example: Cl1735 and Cl1737 are isotopes of Chlorine (Cl)

Atomic number (Indicated as subscript) is same for both of the isotopes i.e.; 17.

Mass number (Indicated as superscript) is different for both the isotopes i.e.; 35 and 37.

  • Further, Mass number= Number of protons+ Number of neutrons
  • Number of protons= Atomic number
  • Number of neutrons= Mass number- Number of protons

The value of neutrons, which are present inside the nucleus along with the protons) for both of the isotopes are listed below.

IsotopeCl1735Cl1737
Mass number35 u37 u
Number of neutrons35-17= 1837- 17= 20

Therefore, isotopes have different mass number, because their nuclei contain different number of neutrons.


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