Please select a subject first
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The sub-atomic particle with negative charge and negligible mass.
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Protons and neutrons present in the nucleus.
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The electrons present in the outermost shell.
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Arrangement of electrons in the shells of an atom.
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The sum of the number of protons and neutrons of an atom.
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The smallest unit of an element which takes part in a chemical reaction.
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Multiple Choice Questions
The outermost shell of an atom is known as
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Multiple Choice Questions
number of valence electrons present in magnesium is
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Name three fundamental particles of the atom. Give the symbol with charge, on each particle.
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Define the term Atomic number.
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Mention briefly the salient features of Dalton’s atomic theory (five points)
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What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?
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Explain the rule with example according to which electrons are filled in various energy levels
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What are the two main parts of which an atom is made of?
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Gases become good conductors of electricity under ........ (low/high) pressure and .............. (low/high) voltage electrical discharge.
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The electrons revolving in shells close to the nucleus are called ................... electrons.
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In an atom, the last shell containing electrons is called its..................shell.
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The γ-rays are............................ radiations, like light.
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Tick the most appropriate answer.
Which of the following scientists observed that cathode rays consists of negatively charged particles?
- John Dalton
- J J Thomson
- James Chadwick
- Democritus
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Tick the most appropriate answer.
In 1908, R A Millikan found the charge of an electron to be
- 1.6 x 10-19 C
- 1.6 x 10-15 C
- 1.4 x 10-19 C
- 1.6 x 19-16 C.
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