Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6 $\mathrm{\mathop A\limits^o }$. The radius of the third Bohr orbit of He$^+$ is __________ picometer. (Nearest Integer)
Answer (integer)
270
Solution
<p>Radius of 3<sup>rd</sup> Bohr orbit of He$^{+3}$</p>
<p>$= 0.6 \times {{{{(3)}^2}} \over 2}$</p>
<p>$= 0.3 \times 9$</p>
<p>$= 2.7\,\mathop A\limits^o$</p>
<p>$= 270 \times {10^{ - 12}}$ ppm</p>
About this question
Subject: Chemistry · Chapter: Atomic Structure · Topic: Bohr's Model
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