Mendeleev ordered elements by atomic weight and chemical similarity, left gaps where the pattern broke, and used neighbouring elements to predict the missing ones' properties.
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Ice floats because hydrogen bonds lock water molecules into an open crystal lattice that is less dense than liquid water. This lets lakes freeze from the top down, protecting aquatic life.
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Honey has very little available water, is acidic, and contains some hydrogen peroxide, so microbes cannot grow in it. It stays stable as long as it is sealed and kept dry.
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A phase transition is an abrupt change in a system's macroscopic properties as conditions like temperature or pressure vary. It happens when competing energy and entropy terms switch which one dominates.
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