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प्रश्न
State one observation which shows that atom is not indivisible.
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उत्तर
Chadwick discovered neutral particles present in an atom by bombarding light nuclei like beryllium with alpha particles, i.e. helium nuclei.
4Be9 + 2He4 → 6C12 + 0n1
Discovery of the neutron also showed that an atom is divisible.
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संबंधित प्रश्न
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a non-metal.
How many electrons are required or released by each atom in calcium oxide to attain the nearest noble gas configuration?
How does the Modern atomic theory contradict and correlate with Dalton's atomic theory?
Define the term:
orbit
Write the formula of its (X)
sulphate
nitrate
phosphate
carbonate
hydroxide.
Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.
Complete the table give below.
| Element |
Atomic number |
Electron distribution | Valence electrons | Lewis dot structure |
| Lithium | 3 | 1s22s1 | ||
| Boron | 5 | 1s22s22p1 | ||
| Oxygen | 8 | 1s22s22p4 |
______ theory explains the formation of molecules.
______ is the only noble gas that does not have eight electrons in its valence shell.
| Name of compound | Type of compound | |
| a. | Sodium chloride | ______ |
| b. | ______ | co-ordinate covalent compound |
| c. | Methane | ______ |
| d. | Fluorine molecule | ______ |
