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Science TNSB Mentoring
Class 9
Atomic structure
Nuclear variations and the rules of reactions
1.
Isotopes and subatomic particles
Question:
3
m.
1
.
Among the following, the odd pair is
\(_{8}\textrm{O}^{18}\), \(_{9}\textrm{F}^{19}\)
\(_{18}\textrm{Ar}^{40}\), \(_{7}\textrm{N}^{14}\)
\(_{14}\textrm{Si}^{30}\), \(_{15}\textrm{P}^{31}\)
\(_{20}\textrm{Cr}^{40}\), \(_{19}\textrm{K}^{39}\)
2
.
Change in the number of neutrons in an atom changes it to
an isotope.
another element.
an ion.
an isobar.
3
.
The term nucleons refer to
protons and neutrons.
protons and electrons.
electrons and neutrons.
only neutrons.
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