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Atomic Mass

Isotopes are ...

Question

Isotopes are atoms with the same number of protons , but differing numbers of neutrons . Isotopes are different forms of a single element.

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False

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Solution

The correct option is A True
Isotopes: Isotopes are atoms with the same number of protons , but differing numbers of neutrons . Isotopes are different forms of a single element .
Examples: Carbon 12 and Carbon 14 are both isotopes of carbon , one with 6 neutrons and one with 8 neutrons (both with 6 protons ).

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Q. Statement 1:

_{6}^{13} C

_{6}^{14} C

are isotopes of the element carbon.
Statement 2: Isotopes of an element have the same number of protons in the nucleus but have a different number of neutrons.

Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

Q. The isotopes of an element contain :

(a) same number of neutrons but different number of protons

(b) same number of neutrons but different number of electrons

(c) different number of protons as well as different number of neutrons

(d) different number of neutrons but same number of protons

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. Isotopes of an element have
(a) the same physical properties (b) different chemical properties
(c) different number of neutrons (d) different atomic numbers.

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