Metals
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Metals
Tina Mon May 19, 2008 10:30 am
Metals
Physical Properties of Metals include shiny luster, grayish - silver color, hardness, good heat and electricity conductivity( a high level of electricity or heat to go through), high melting and boiling points, malleability (can be hammered into a sheet) and ductility (can be pulled into a wire). Some exceptions to these are the metals - sodium and calcium (very soft), gold and copper (yellowish color), and mercury (low melting and boiling points).Chemical Properties of Metals
Some metals are more reactive than others. This is because very reactive metals lose electrons easily. Metals such as sodium are very reactive and are explosive in air. Metals such as gold are very unreactive, and therefore do not corrode or tarnish in air.
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.
The 38 elements in groups 3 through 12 of the periodic table are called "transition metals". As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat. The interesting thing about transition metals is that their valence electrons, or the electrons they use to combine with other elements, are present in more than one shell. This is the reason why they often exhibit several common oxidation states. There are three noteworthy elements in the transition metals family. These elements are iron, cobalt, and nickel, and they are the only elements known to produce a magnetic field.
Alkaline Earth Metals, series of six chemical elements in group 2 (or IIa) of the periodic table (see Periodic Law). They are strong reducing agents, that is, they give up electrons easily. They are less reactive than the alkali metals, but reactive enough not to be found free in nature. Although rather brittle, the alkaline earth metals are malleable and extrudable. They conduct electricity well, and when heated, burn readily in air. The alkaline earth metals are, in order of increasing atomic number, beryllium, magnesium, calcium, strontium, barium, and radium. Their oxides are called alkaline earths.
By Tina
Metals Physical Properties of Metals include shiny luster, grayish - silver color, hardness, good heat and electricity conductivity( a high level of electricity or heat to go through), high melting and boiling points, malleability (can be hammered into a sheet) and ductility (can be pulled into a wire). Some exceptions to these are the metals - sodium and calcium (very soft), gold and copper (yellowish color), and mercury (low melting and boiling points).Chemical Properties of Metals
Some metals are more reactive than others. This is because very reactive metals lose electrons easily. Metals such as sodium are very reactive and are explosive in air. Metals such as gold are very unreactive, and therefore do not corrode or tarnish in air.
The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.
The 38 elements in groups 3 through 12 of the periodic table are called "transition metals". As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat. The interesting thing about transition metals is that their valence electrons, or the electrons they use to combine with other elements, are present in more than one shell. This is the reason why they often exhibit several common oxidation states. There are three noteworthy elements in the transition metals family. These elements are iron, cobalt, and nickel, and they are the only elements known to produce a magnetic field.
Alkaline Earth Metals, series of six chemical elements in group 2 (or IIa) of the periodic table (see Periodic Law). They are strong reducing agents, that is, they give up electrons easily. They are less reactive than the alkali metals, but reactive enough not to be found free in nature. Although rather brittle, the alkaline earth metals are malleable and extrudable. They conduct electricity well, and when heated, burn readily in air. The alkaline earth metals are, in order of increasing atomic number, beryllium, magnesium, calcium, strontium, barium, and radium. Their oxides are called alkaline earths.
By Tina
Tina- Posts : 8
Join date : 2007-12-10
Age : 28
Location : Taiwan
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