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Science TNSB Mentoring
Class 9
Atomic structure
Early models of the atom
1.
Atoms
Question:
3
m.
1
.
In an atom, electrons revolve around the nucleus in fixed orbits.
False
True
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
The atomic numbers of isotopes of a given element differ.
Isotopes of an element have the same atomic numbers.
3
.
Electrons have negligible mass and charge.
True
False
The mass and charge of electrons are negligible.
Electrons have a negative charge and have a negligible mass.
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