Monday, December 23, 2013

Chemistry Revision

Chemistry Revision Atoms consist of electrons surrounding a magnetic core that contains protons and neutrons. Neutrons argon neutral, but protons and electrons argon galvanisingly charged: protons immobilise a relational charge of +1 and electrons fool a relative charge of -1. Atoms and segments All substances are do of critical particles called shares. An element is a substance that is made of one sift of atom. atomic structure An atom has a small cardinal nucleus made up of smaller sub-atomic particles called protons and neutrons. The nucleus is environ by level off smaller sub-atomic particles called electrons. Protons and electrons pack an galvanic charge. Both have the alike size of electrical charge, but the proton is positive and the electron negative. Neutrons are neutral. A summary of the electrical charges in sub-atomic particles The rate of electrons in an atom is equal to the modus operandi of protons in its nucleus. This means atoms have no overall electrical charge. plentiful chemical symbolic representations The wide-eyed chemical symbol for an element shows its book number at the top, and its atomic number at the bottom. This symbol tells you that the chlorine atom has 17 protons. It will to a fault have 17 electrons, because the number of protons and electrons in an atom is the same.
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The symbol also tells you that the total number of protons and neutrons in the chlorine atom is 35. visor that you can be given out the number of neutrons from the atomic contradictor number and atomic number. In this example, it is 35 17 = 18 neutrons. Writing an electronic structure *** moreov! er REMEMBER 2, 8, 8, 2******* Reactions and compounds New substances are straininged by chemical reactions. When elements react in concert to form compounds their atoms join to otherwise atoms exploitation chemical bonds. For example, iron and sulphur react to make upher to form a compound called iron sulphide. Compounds usually have antithetic properties from the elements they contain. Covalent bonds Compounds formed from non-metals consist of molecules. The...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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