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CHEMISTRY [3 Mark Question Answer]

Atomic Structure · ICSE STD 8 (ICSE - English Medium). 2 questions.

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[3 Mark Question Answer]

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Question 13 Marks
What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?
Answer
Following were the observations made by Rutherford:
$1.$ Most of the alpha particle passed straight through the foil without any deflection from their path.
$2.$ A small fraction of them were deflected from their original path by small angles.
$3.$ Only a few particles bounced back
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Question 23 Marks
What are the two main features of Rutherford’s atomic model?
Answer
According to Rutherford’s model an atom consists of:
$1.$The centrally located nucleus: The nucleus is a centrally located positively charged mass. The entire mass of the atom is concentrated in it. It is the densest part of the atom. Its size is very small as compare to the atom as a whole.
$2.$The outer circular orbits: Electrons revolve in circular orbits $($shell$)$ in the space available around the nucleus. An atom is electrically neutral i.e., number of protons and electrons present in an atom are equal.
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[3 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip