Question

Where are isotopes of the same elements having different atomic masses placed in the periodic table

Answer 1

Isotopes and their corresponding elements are placed in same place in the periodic table.

Explanation:

• Isotopes are atoms that have the same number of protons but the different numbers of the neutron in their nuclei.
• Considering chlorine as an example, it may be noted that the relative atomic mass of chlorine is 35.5.
• This means that all chlorine atoms have 17 protons (atomic number = proton number).
• But isotopes of chlorine called $Cl_{35}$ and $Cl_{37}$ has different number of neutrons.
• The elements are placed in the periodic table according to the atomic number and atomic mass.
• As the atomic mass of elements is calculated using the average mass of both the isotopes.
• Thus the elements, as well as its isotopes, are placed in the same place in the periodic table.

Learn more about isotopes

How do the three isotopes of hydrogen differ

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29. Iron in nature exists in three isotopic forms :

Fe54, Fe56, Fe57. The percentage abundance

of Fe54 and Fe57 are equal and the average

atomic mass of Fe is 55.95 then percentage

abundance of Fe56 is

(1) 80%

(2) 85%

(3) 90%

(4) 95%

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