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Atomic mass of an element is not necces...

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

A

It contains electrons ,photons and neutrons

B

It excists in allotropic forms

C

It containts isotopes

D

Atom are no longer indivisible

Text Solution

Verified by Experts

The correct Answer is:
C
Atomic number
` = ((% "Abundance" ) xx ("isotope") + % "of" ("isotope")_(2))/(100)`
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Knowledge Check

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

    A
    they can’t be determined very accurately
    B
    the atoms ionize during the determinatio
    C
    of the existence of isotopes
    D
    of the presence of impurities

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    A
    they cannot be determined very accurately
    B
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    D
    of the presence of impurities

  • The mass of an atom is due to the masses of protons and neutrons in the nucleus. The relative masses of protons and neutrons are almost equal to one. Therefore, the atomic mass of an element should be nearly a whole number. But in many cases the atomic masses are fractional. The main reason for these fractional atomic masses is that these elements occur in nature as a mixture of several isotopes. The atomic mass of an element is the average of the atomic masses of these isotopes in the ratio of their proportion of occurrence. The fractional atomic masses of elements are due to the existence of

    A
    isotopes having different masses
    B
    diagonal relationship
    C
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    D
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    The mass of an atom is due to the masses of protons and neutrons in the nucleus. The relative masses of protons and neutrons are almost equal to one. Therefore, the atomic mass of an element should be nearly a whole number. But in many cases the atomic masses are fractional. The main reason for these fractional atomic masses is that these elements occur in nature as a mixture of several isotopes. The atomic mass of an element is the average of the atomic masses of these isotopes in the ratio of their proportion of occurrence. An element occurs in two isotopic forms with atomic masses 10 and 11. What is the percentage abundance of two isotopes in the sample having atomic mass 10.80?

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