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प्रश्न
State two observations which show that atom is not indivisible.
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उत्तर
Two observations, which show that an atom is divisible are-
(1) Discharge-tube experiment : In J. J. Thomson's experiment, the stream of cathode rays in the gas-discharge tube shows the presence of negatively charged subatomic particles called electrons.
(2) In Goldstein's experiment, the faint red glow in the gas discharge tube shows the presence of positively charged subatomic particles called protons.
These experiments show that atoms are divisible and made up of subatomic particles, electrons, protons and neutrons.
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संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
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Sodium hydroxide
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Write the full form of IUPAC.
Name the three subatomic particles present in an atom.
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Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Define the following term:
Atom
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Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
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Define the following term with an example.
Metalloid
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