[Verse 1] Sunlight on an empty chair, An open book, a breath of air. The book and air both take up space; The light is different in this case. Matter has both mass and volume. I write the difference in the margin: How much matter, how much space— Two questions on the very same page. [Chorus] Look a little closer, Let the picture open wide. Most atomic mass is central; The electron cloud is outside. [Verse 2] Positive protons in the center, Neutrons with no charge beside. Negative electrons in the cloud; Matched counts balance out the charge. Change the neutrons, keep the protons: An isotope, the same element still. The drawing helps explain a structure; It's a guide, not the atom's actual size. [Final Chorus] Look a little closer, Let the picture open wide. Most atomic mass is central; The electron cloud is outside.
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