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Subjects
Science State Board
Class 9
Atomic structure
Textbook questions
3.
State true or false. If false, correct the statement I
Exercise condition:
3
m.
1
.
In an atom, electrons revolve around the nucleus in fixed orbits.
True
False
Electrons in an atom occasionally revolve in fixed orbits around the nucleus.
Electrons in an atom revolve in fixed orbits around the nucleus.
2
.
Isotopes of an element have the different atomic numbers.
False
True
Isotopes of an element have the same atomic numbers.
The atomic numbers of isotopes of a given element differ.
3
.
Electrons have negligible mass and charge.
False
True
Electrons have a negative charge and have a negligible mass.
The mass and charge of electrons are negligible.
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