V 1 mol Na = \(\dfrac{23}{0,97}\)= 23,7113cm\(^3\) gồm 6,02.10\(^{23}\) nguyên tử Na
V 1 nguyên tử Na = \(\dfrac{23,7113.74}{6,02.10^{23}.100}\)= 2,915.10\(^{-23}\) cm\(^3\)
Bán kính nguyên tử Na là :
r = \(\dfrac{4\pi r^3}{3}\)= 2,915.10\(^{-23}\) cm\(^3\)
\(\Rightarrow\) r\(^3\) = 6,962.10\(^{-24}\) \(\Rightarrow\) r = 1,909 . 10\(^{-8}\) cm