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प्रश्न
(a) What are isotopes ? Explain by giving an example.
(b) Give one similarity and one difference between a pair of isotopes.
(c) Give the number of protons, neutrons and electrons per atom in the two isotopes of chlorine `""_17^35"Cl"` and `""_17^35"Cl"`.
उत्तर
(a) Isotopes are the atoms of the same element with the same atomic number but different mass numbers. It means that the isotopes have same number of electrons and protons but different number of neutrons. For example, hydrogen has three isotopes- protium, deuterium and tritium .
Here, all three of them have same atomic number i.e. 1 but different mass numbers.
(b) Similarity –A pair of isotopes have the same atomic number.
Difference – A pair of isotopes have different mass numbers.
(c) In `""_17^35"Cl"`, there are 17 protons, 17 electrons and 18 neutrons.
In `""_17^35"Cl"`, there are 17 protons, 17 electrons and 20 neutrons.
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संबंधित प्रश्न
State one use of radioactive isotopes in medicine.
Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
State one use of radioactive isotopes in industry.
State whether the following statement is true or false :
Radioactive isotope of iodine is used for making the medicine called tincture iodine.
Explain why, the atomic masses of many elements are in fractions and not whole numbers.
The isotopes of an element contain :
Atom A has a mass number 209 and atomic number 82.
Atom B has a mass number 209 and atomic number 83.
(i) How many protons atom A has ?
(ii) How many protons atom B has ?
(iii) Are atoms A and B isotopes of the same element ?
The composition of two atomic particles is given below :
| X | Y | |
| Protons : | 8 | 8 |
| Neutrons : | 8 | 9 |
| Electrons : | 8 | 8 |
(i) What is the mass number of X ?
(ii) What is the mass number of Y ?
(iii) What is the relation between X and Y ?
(iv) Which element/elements do they represent ?
According to Dalton’s Atomic Theory, atoms of the same element are identical in all respects. But according to the Modern Atomic Theory, this postulate is proved wrong. Explain.
______ is a radioactive isotope present in our body.
