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Octet Rule

Isotopes are ...

Question

Isotopes are the atoms of same element, with same atomic number. But with different __________.

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Solution

Mass Number

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

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. 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:

Q. Assertion: Isotopes are electrically neutral
Reason: Isotopes are species with same mass number but different atomic number

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