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>>Structure of Atom
>>Isobars and Isotopes
>> $Atomic mass of an element is not a whole$

Question

Atomic mass of an element is not a whole number because:

A

it contains electrons, protons and neutrons

B

it contains isotopes

C

it contains allotropes

D

all of the above

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Updated on : 2022-09-05

Solution

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Correct option is B)

Atomic mass of an element is not a whole number because It contains isotopes.
For example, chlorine has two isotopes $_{17}^{35} C l$ and $_{17}^{37} C l$ with natural abundances in the approximate ratio of 3:1. Hence, the average atomic mass of chlorine is approximately 35.5 g/mol.

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Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses.
(ii) Isotopes of an element have same atomic number.
(iii) Isotopes of an element show same physical properties.
(iv) Isotopes of an element show same chemical properties.

Atomic mass of an element is not necessarily a whole number becuase :

Which of the following are characteristics of isotopes of an element?
$(i)$ Isotopes of an element have the same atomic masses.
$(i i)$ Isotopes of an element have the same atomic number.
$(i i i)$ Isotopes of an element show the same physical properties.
$(i v)$ Isotopes of an element show the same chemical properties.

The nucleodic masses of $^{14} N$ and $^{15} N$ are mixed to give atomic mass of 14.1. What is the ratio of the two isotopes as a whole number.

The relative atomic masses of many elements are not whole numbers because :

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