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Question

Which of the properties of isotopes of an element is different?

A
Valency
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B
Valence electron
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C
Electronegativity
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D
Melting point and boiling point
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Solution

The correct option is D Melting point and boiling point
Isotopes are the elements with the same atomic number but the different mass numbers. Since they have the same atomic number, means the same number of electrons and thus has the same similar chemical properties.

However, the numbers of neutrons are different, which affects the mass number. The mass number determines the physical properties such as boiling/melting/density etc.

Option D is correct

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