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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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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