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Scale of atomic mass is...

Scale of atomic mass is

A

C-14

B

C-13

C

C-12

D

All of these

Text Solution

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The correct Answer is:
C
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Atom| molecule| Atomic mass | Molecular mass| Average atomic mass

Isotopes are the atoms of same element, they have same atomic number but different mass numbers. Isotopes have different number of neutrons in their nucleus . If an element exists in two isotopes having atomic masses 'a' and 'b' in the ratio m:n, then average atomic mass will be (mxxa+nxxb)/(m+n) Different isotopes of same element have same position in the periodic table. the elemens which have single isotope are called monoisotropic elements. Greater is the percentage composition of an isotope, more will be its abundance in nature. Which of the following isotopes is/are used to decide the scale of atomic mass?

Knowledge Check

  • The use of ""^(12)C scale has superseded the older scale of atomic mass based on ""^(16)O isotope, one important advantage of the former being

    A
    the atomic masses on `""^(12) C` scale became whole numbers
    B
    `""^(12)C` is more abundant in the earth's crust than `""^(16)O`
    C
    the difference between the physical and chemical atomic masses got narrowed down significantly
    D
    `""^(12)C` is situated midway between metals and non-metals in the periodic table.

  • Choose the correct statement The use ""^(12)C Scale has suspended the older scale of atomic mass based in ""^16O isotope, one important advantage of the former being

    A
    the atomic masses on `""^12C` scale became whole numbers.
    B
    `""^12C` is more abundant in the earth"s crust than `""^16O`
    C
    The difference between the physical and chemical atomic masses got narrowed down significantly
    D
    `""^12C` is situated midway between metals and non-metals in the periodic table

  • Choose the correct statement The use of .^(12)C scale has superseded the older scale of atomic mass based on .^(16)O isotope, one important advantage of the former being

    A
    The atomic masses on `.^(12)C` scale became whole numbers.
    B
    `.^(12)C` is more abundant in the earth's crust than `.^(16)O`
    C
    The difference between the physical and chemical atomic masses got narrowed down significantly
    D
    `.^(12)C` is situated midway between metals and nonmetals in the periodic table

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    (A) Mass spectrometer is used for determination of atomic mass of isotopes. (R) Isotopes are the atoms of same element having same atomic number but different mass numbers.

    When elements are arranged in the order of increasing atomic masses, the atomic mass of the middle element is roughly the average of the atomic masses of the other two elements' ------ this law is known as:

    The modern atomic mass scale is based on :-

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