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Isotopes are ...

Question

Isotopes are atoms of an element that have the same number of and electrons but different number of .

A

protons

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B

neutrons

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C

anions

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D

cations

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Solution

The correct options are
A protons
B neutrons
Isotopes are atoms of an element that have the same number of protons and electrons but different number of neutrons.
Example: Carbon exist as 3 isotopes C -12, C- 13 and C- 14. Carbon-12 is only one isotope of the element carbon, with 6 protons and 6 neutrons. Carbon-13, with 6 protons and 7 neutrons, and carbon-14, with 6 protons and 8 neutrons.

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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.

Q. ............... of an element are the atoms of same element having same atomic number but different mass number.

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.

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 an element having same atomic number but different mass numbers are called _______________.

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