(B) Atoms are the fundamental building blocks of matter. Their size is on the order of $10^{-10} \, m$ ($\mathring{A}$ scale). Because they are signif

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(B) Atoms are the fundamental building blocks of matter. Their size is on the order of $10^{-10} \, m$ ($\mathring{A}$ scale). Because they are significantly smaller than the wavelength of visible light, they cannot be seen even with a standard light microscope. Therefore, they are classified as sub-microscopic particles.