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Isobars and Isotopes

Many elements...

Question

Many elements have non-integral atomic masses because

A

They have isotopes

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B

Their isotopes have non-integral masses

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C

Their isotopes have different masses

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D

None of these

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Solution

The correct options are
A They have isotopes
C Their isotopes have different masses
Non integral atomic masses of elements are due to existence of isotopes of that element which have different masses. And these isotopes occur in nature in different proportion.

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Q. Many elements have non-integral atomic masses because

Q. Many elements have non integral atomic masses because :

Q. Isotopes of an element have the same atomic number but a different ________.

Isotopes are the atoms of the same element; they have the same atomic number but different mass numbers. Isotopes have a 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

\frac{m \times a + n \times b}{m + n}

Different isotopes of the same element have the same position in the periodic table. The elements which have single isotope are called monoisotopic elements. Greater is the percentage composition of an isotope, more will be its abundance in nature.

Answer the following questions:

The ratio of the mass of

^{12} C

atom to that of an atom of element= X (whose atomicity is four) is 1:9. The molecular mass element X is:

Q. Assertion :Isotopes have different atomic numbers. Reason: Isotopes must have different numbers of electrons.

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