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A nucleus made of protons and neutrons surrounded by a cloud of electrons equal in number to the protons.

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organization breaks down, these holes can be occupied by molecules. Most simple substances, with the exception of water and type metal, expand upon melting, because the atoms are closely packed in the solid … be occupied by molecules. [...]"? Does it mean that when ice melts, the water molecules fill the empty spaces left by the atoms? I am not sure if my question is properly formatted, if you need more information I can edit it. I would appreciate if someone explains this particular topic a bit deeper. …
asked May 7 '17 by Pablo Ivan