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प्रश्न
State two observations which show that atom is not indivisible.
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
Write the names of the elements present in the :-
Sulphuric acid
Write the names of the elements present in the:-
Acetic acid
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Fill in the blank
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What is an atom ? How do atoms usually exist ?
Electron, proton, neutron are the types of ______ in an atom.
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Maharshi Kanada
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Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
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State true or false. If false, correct the statement.
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Name the sub-atomic particles.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Define the following term with an example.
Metal
______ is the smallest particle of an element.
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