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प्रश्न
State the main postulates of Dalton’s atomic theory.
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उत्तर
- Matter consists of small indivisible particles called atoms, i.e., an atom is the basic unit of matter.
- Atoms of the same element are alike in all respects, i.e., atoms of hydrogen have the same properties, such as mass and density, and atoms of oxygen are alike in all respects.
- Atoms of different elements are different from each other. i.e., atoms of hydrogen are different from atoms of oxygen.
- An atom can neither be created nor destroyed.
- Atoms combine with other atoms in a simple whole-number ratio, forming compounds or molecules.
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संबंधित प्रश्न
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Which sub-atomic particles in the 3 isotopes of ‘H’ are the same.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
Mass No =______ + No. of Neutrons.
If an atom has 6 electrons in its outermost shell, it is inert.
What is the relation between mass number & atomic number?
In which one of the following, the number of protons is greater than the number of neutrons but number of protons is less than the number of electrons?
