NCERT Exemplar IX — task. Science CBSE, Class 9.

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

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1. Is it possible for the atom of an element to have one electron, one proton and no neutron. If so, name the element.

No, there is no element as such.
Yes, helium has \(1\) electron, \(1\) proton and no neutron. It is represented as \(_{1}\textrm{He}^{2}\).
Yes, hydrogen has \(1\) electron, \(1\) proton and no neutron. It is represented as \(_{1}\textrm{H}^{1}\).

2. Will \(_{}\textrm{Cl}^{35}\) and \(_{}\textrm{Cl}^{37}\) have different valencies? Justify your answer.

No, both \(_{}\textrm{Cl}^{35}\) and \(_{}\textrm{Cl}^{37}\) will have same valencies as they are isotopes.
No, both \(_{}\textrm{Cl}^{35}\) and \(_{}\textrm{Cl}^{37}\) will have same valencies as they are isotones.
Yes, both \(_{}\textrm{Cl}^{35}\) and \(_{}\textrm{Cl}^{37}\) will have different valencies as they are isotopes.

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