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Dalton also believed atomic theory could explain why water absorbs different gases in different proportions.For example, he found that water absorbs carbon dioxide far better than it absorbs nitrogen.).In the early 1800s, John Dalton used the concept of atoms to explain why elements always react in ratios of small whole numbers (the law of multiple proportions).For instance, there are two types of tin oxide: one is 88.1% tin and 11.9% oxygen and the other is 78.7% tin and 21.3% oxygen (tin(II) oxide and tin dioxide respectively).Atoms can attach to one or more other atoms by chemical bonds to form chemical compounds such as molecules.The ability of atoms to associate and dissociate is responsible for most of the physical changes observed in nature and is the subject of the discipline of chemistry.This means that 100g of tin will combine either with 13.5g or 27g of oxygen.13.5 and 27 form a ratio of 1:2, a ratio of small whole numbers.

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The protons have a positive electric charge, the electrons have a negative electric charge, and the neutrons have no electric charge.The electrons of an atom are attracted to the protons in an atomic nucleus by this electromagnetic force.The protons and neutrons in the nucleus are attracted to each other by a different force, the nuclear force, which is usually stronger than the electromagnetic force repelling the positively charged protons from one another.Atoms are extremely small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).Atoms are small enough that attempting to predict their behavior using classical physics – as if they were billiard balls, for example – gives noticeably incorrect predictions due to quantum effects.In 1905, Albert Einstein proved the reality of these molecules and their motions by producing the first Statistical physics analysis of Brownian motion.

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