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Subjects
Science CBSE
Class 9
Structure of the atom
Textbook questions

33. NCERT Exemplar IV

Exercise condition:

3 m.

1. The first model of an atom was given by

Rutherford
E. Goldstein
N. Bohr
J.J. Thomson

2. An atom with

$3$ protons and

$4$ neutrons will have a valency of

$4$
$7$
$3$
$1$

3. The electron distribution in an aluminium atom is

$2,3,8$
$2,8,3$
$2,8,2$
$8,2,3$

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