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Isotopes

The atoms of ...

Question

The atoms of different elements which have the same mass number are called______________.

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Solution

ISOBARS: The atoms of different elements with different atomic numbers, which have the same mass number are called isobars.
Isobars contain different numbers of electrons, protons, and neutrons.
Example: ${}_{6}C^{14} and {}_{7}N^{14}$ are isobars.
Hence, The atoms of different elements which have the same mass number are called isobar.

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Q. Atoms having the same atomic number but a different mass number are called ___.

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

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. An element is represented by

_{Z} X^{A}

, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isotopes: Atoms having same number of proton
Isobar: Elements having same mass number
Isotones: Elements having same number of neutron (A-Z)

Which of the following is a pair of isobar?

Q. atom A has a mass number 238 and atomic number 92 and atom B has a mass number 235 and atomic number 92. how many protons, atoms A and B have? how many neutrons, atoms A and B have? are atoms A and B isotopes of the same element? how?

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