ICSE ICSE Class 8 - CISCE Question Bank Solutions

 Give the following a suitable word/phrase
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.

 Multiple Choice Questions

The outermost shell of an atom is known as

 Multiple Choice Questions

number of valence electrons present in magnesium is

Name three fundamental particles of the atom. Give the symbol with charge, on each particle.

Define the term Atomic number. 

Mention briefly the salient features of Dalton’s atomic theory (five points)

What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?

Explain the rule with example according to which electrons are filled in various energy levels

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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Which of the following scientists observed that cathode rays consists of negatively charged particles?

1. John Dalton
2. J J Thomson
3. James Chadwick
4. Democritus

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In 1908, R A Millikan found the charge of an electron to be

1. 1.6 x 10^-19 C
2. 1.6 x 10^-15 C
3. 1.4 x 10^-19 C
4. 1.6 x 19^-16 C.