Describing Chemical Reactions
September 25, 2013 | By David |
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©2011 American Chemical SocietyMiddle School Chemistry Unit 351 Another model o the hydrogen atom shows a cloudy-looking region in the space surrounding the nucleus. This model represents the electron as a cloud to show that it is not possible to know the exact location o an electron. The electron cloud shows the region surrounding the nucleus where the electron is most likely to be. Proton, electrons, and static electricity You can see evidence o electrons and protons attracting or repelling each other when you make static electricity. For example, when you rub a plastic strip between your fngers, electrons move rom your skin to the plastic. I you assume that the plastic and the skin were both neutral beore rubbing, the plastic now has more electrons or negative charges than positive. This gives the plastic an overall or net negative charge. Since your skin lost some negative charge, it now has more positive charge than negative, so your skin has an overall or net positive charge. When you bring the plastic near your fngers, the plastic is attracted because opposite charges attract. I you rub two plastic strips on your fngers, each strip gains electrons so each one has a net nega- tive charge. I you bring the strips near each other, they repel because like charges repel.