Isotopes are the atoms of the same element which have same __ but different _.

atomic number

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mass number

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Solution

Definition of isotopes.
Isotopes are the atoms of the same element which have the same atomic number but different mass number.
They have similar chemical properties and different physical properties.
Isotopes of hydrogen are protium ( ${}_{1}^{1}H$ ),deuterium ( ${}_{1}^{2}H$ ),Tritium ( ${}_{1}^{3}H$ ).
Therefore Isotopes are the atoms of the same element which have same atomic number but different mass number.

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Question 16
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

(a) (i), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Q. Assertion :The mass spectrometer is used for determination of the atomic mass of isotopes.
Reason: Isotopes are the atoms of the same element having a same atomic number but different mass numbers.

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:

Atoms of the same element can have the same atomic number but a different mass number.

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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Isotopes are the atoms of the same element which have same ______ but different _____.

Isotopes are the atoms of the same element which have same __ but different _.