42301
Descrição
FlashCards por Laura Johnstone, atualizado more than 1 year ago
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Criado por Laura Johnstone
aproximadamente 11 anos atrás
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| Questão | Responda |
| The periodic table All the different elements are arranged in a chart called the periodic table. The horizontal rows are called periods. The vertical columns are called groups. Elements in the same group are similar to each other. The metals are on the left and the non-metals are on the right. One non-metal, hydrogen, is often put in the middle. The main groups are numbered from 1 to 7 going from left to right, and the last group on the right is group 0. | The zig-zag line in this diagram separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal but it is often put in the middle. Notice that most elements are metals, rather than non-metals. Each element has its own chemical symbol, made from letters. Remember that you will only find elements in the periodic table and never compounds. So don't try to look for substances like water and copper sulphate in the periodic table, because they are not there. |
| Metals Iron, magnesium and gold are examples of metal elements. All metals have these properties in common: They are shiny, especially when they are freshly cut. They are good conductors of both heat and electricity. They can be bent without breaking (they are malleable). Most metals also have these properties: they are solid at room temperature, except mercury, which is liquid at room temperature they are hard and strong they have a high density (they feel heavy for their size) they make a ringing sound when they are hit (they are sonorous) Mercury is the only metal that is liquid at standard room temperature and pressure Mercury is the only liquid metal at room temperature. Three metals are magnetic. These are iron, cobalt and nickel. Steel is a mixture of elements but mostly iron, so it is also magnetic. The other metals are not magnetic. | Uses of metals You may have to match the use of a metal with a property that makes it suitable for that use. For example, copper is used for electrical wiring because it is a good conductor of electricity, not because it is a good conductor of heat. |
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