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Subjects
Science State Board
Class 9
Atomic structure
Textbook questions

1. Choose the correct answer I

Exercise condition:

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

another element.
an isotope.
an ion.
an isobar.

3. The term nucleons refer to

only neutrons.
electrons and neutrons.
protons and neutrons.
protons and electrons.

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