(C) According to the kinetic theory of gases and experimental evidence from atomic physics, the size of an atom is approximately $1 \, \text{Å}$ $(\ma

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(C) According to the kinetic theory of gases and experimental evidence from atomic physics, the size of an atom is approximately $1 \, \text{Å}$ $(\mathring{A})$.Since $1 \, \text{Å} = 10^{-10} \, m$, the order of magnitude of the dimension of an atom is $10^{-10} \, m$.Therefore, the correct option is $C$.