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प्रश्न
Three different atoms of oxygen are represented as :
`""_8^16"O"`, `""_8^17"O"`, `""_8^16"O"`
(i) What do the subscripts (lower figures) and superscripts (upper figures) represent ?
(ii) What factor is responsible for the change in the superscripts 16, 17 and 18, though the element is the same ?
(iii) What is the usual name for such atoms of an element ?
(iv) Give the nuclear composition of `""_8^16"O"`.
उत्तर
(i) Subscript represents atomic number, whereas superscript represents atomic mass.
(ii) Number of neutrons is responsible for the change in superscripts.
(iii) Isotope is the usual name for such atoms of an element.
(iv) Nuclear composition of `""^18"O"_8` is -
No. of protons = 8
No. of neutrons = 18 − 8 = 10
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संबंधित प्रश्न
Fill in the blanks of the following statement :
An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ___________.
What name is given to those isotopes which have unstable nuclei and emit various types of radiations ?
What is the reason for the different atomic masses of the isotopes of an element ?
In a sample of ethyl ethanoate (CH3COOC2H5), the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it ?
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 ?
Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37.
- What is meant by “atomic number of an element”? What do you understand by an ‘atom’
- Write down the electronic configuration of the chlorine atom.
- State the number of protons, electrons, and neutrons in the following isotopes: 35Cl17, 37Cl17
- Explain why the two atoms in (iii) above have the same chemical reactions.
- If molten magnesium chloride is electrolyzed suggest a suitable electrode [anode].
Give the reason why isotopes have the same chemical but different physical properties.
______ isotope is used in the nuclear reactors.
In two isotopic species, a number of protons is the same but the number of ______ is different.
Explain radioactive decay and radioactive isotopes.
