METALS!!!! BY ANGEL =DD COME IN CC XDDD YEAH~~~~~^_<
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METALS!!!! BY ANGEL =DD COME IN CC XDDD YEAH~~~~~^_<
angel_fang423 Mon May 19, 2008 10:50 am
METALS...chimecal reaction:
A process which atoms are redistributed resulting in change in the molecular composition of substances. One example of a chemical reaction is formation of rust (iron oxide), which is produced when oxygen in the air reacts with iron.
The products obtained from a given set of reactants, or starting materials, depend on the conditions under which a chemical reaction occurs. Careful study, however, shows that although products may vary with changing conditions, some quantities remain constant during any chemical reaction. These constant quantities, called the conserved quantities, include the number of each kind of atom present, the electrical charge, and the total mass.
In order to discuss the nature of chemical reactions, certain basic facts about chemical symbols, nomenclature, and the writing of formulas must first be understood. All substances are made up of some combination of atoms of the chemical elements. Rather than full names, scientists identify elements with one- or two-letter symbols. Some common elements and their symbols are carbon, C; oxygen, O; nitrogen, N; hydrogen, H; chlorine, Cl; sulfur, S; magnesium, Mg; aluminum, Al; copper, Cu; silver, Ag; gold, Au; and iron, Fe.
Most chemical symbols are derived from the letters in the name of the element, most often in English, but sometimes in German, French, Latin, or Russian. The first letter of the symbol is capitalized, and the second (if any) is lowercase. Symbols for some elements known from ancient times come from earlier, usually Latin, names: for example, Cu from cuprum (copper), Ag from argentum (silver), Au from aurum (gold), and Fe from ferrum (iron). The same set of symbols in referring to chemicals is used universally. The symbols are written in Roman letters regardless of language.
Symbols for the elements may be used merely as abbreviations for the name of the element, but they are used more commonly in formulas and equations to represent a fixed relative quantity of the element. Often the symbol stands for one atom of the element. Atoms, however, have fixed relative weights, called atomic weights, so the symbols often stand for one atomic weight of the element.
Physical properties of a material are those properties that do not depend on the chemical behavior of the material. Physical properties include the state of a material (gas, liquid, or solid), melting point, boiling point, crystal structure, and electrical conductivity.
Metals are generally very strong and resistant to different types of stresses. Though there is considerable variation from one metal to the next, in general metals are marked by such properties as hardness, the resistance to surface deformation or abrasion; tensile strength, the resistance to breakage; elasticity, the ability to return to the original shape after deformation; malleability, the ability to be shaped by hammering; fatigue resistance, the ability to resist repeated stresses; and ductility, the ability to undergo deformation without breaking.
Alkali Metals:sleep:
Alkali metals react with other elements by losing one electron. Alkali metals are shiny and soft that can be cut down with a plastic knife. The two most important alkali metals are sodium and potassium.
Alkali Metals, series of six chemical elements in group 1 (or Ia) of the periodic table (see Periodic Law). They are soft compared to other metals, have low melting points, and are so reactive that they are never found in nature uncombined with other elements. They are powerful reducing agents, that is, they give up an electron easily, and react violently with water to form hydrogen gas and hydroxides, or strong bases. The alkali metals are, in order of increasing atomic number, lithium, sodium, potassium, rubidium, cesium, and francium. Francium exists only in a radioactive form.
ALKALINE EARTH METALS
Alkaline earth metals which is fairly hard, gray-white, and a good conductor of electricity. The two most common alkaline earth metals are magnesium and calcium.
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.
TRANSITION ELEMENTS
The products obtained from a given set of reactants, or starting materials, depend on the conditions under which a chemical reaction occurs. Careful study, however, shows that although products may vary with changing conditions, some quantities remain constant during any chemical reaction. These constant quantities, called the conserved quantities, include the number of each kind of atom present, the electrical charge, and the total mass.
Chemical Symbols |
In order to discuss the nature of chemical reactions, certain basic facts about chemical symbols, nomenclature, and the writing of formulas must first be understood. All substances are made up of some combination of atoms of the chemical elements. Rather than full names, scientists identify elements with one- or two-letter symbols. Some common elements and their symbols are carbon, C; oxygen, O; nitrogen, N; hydrogen, H; chlorine, Cl; sulfur, S; magnesium, Mg; aluminum, Al; copper, Cu; silver, Ag; gold, Au; and iron, Fe.
Most chemical symbols are derived from the letters in the name of the element, most often in English, but sometimes in German, French, Latin, or Russian. The first letter of the symbol is capitalized, and the second (if any) is lowercase. Symbols for some elements known from ancient times come from earlier, usually Latin, names: for example, Cu from cuprum (copper), Ag from argentum (silver), Au from aurum (gold), and Fe from ferrum (iron). The same set of symbols in referring to chemicals is used universally. The symbols are written in Roman letters regardless of language.
Symbols for the elements may be used merely as abbreviations for the name of the element, but they are used more commonly in formulas and equations to represent a fixed relative quantity of the element. Often the symbol stands for one atom of the element. Atoms, however, have fixed relative weights, called atomic weights, so the symbols often stand for one atomic weight of the element.
Physical Properties |
Physical properties of a material are those properties that do not depend on the chemical behavior of the material. Physical properties include the state of a material (gas, liquid, or solid), melting point, boiling point, crystal structure, and electrical conductivity.
Metals are generally very strong and resistant to different types of stresses. Though there is considerable variation from one metal to the next, in general metals are marked by such properties as hardness, the resistance to surface deformation or abrasion; tensile strength, the resistance to breakage; elasticity, the ability to return to the original shape after deformation; malleability, the ability to be shaped by hammering; fatigue resistance, the ability to resist repeated stresses; and ductility, the ability to undergo deformation without breaking.
Alkali Metals:sleep:
Alkali metals react with other elements by losing one electron. Alkali metals are shiny and soft that can be cut down with a plastic knife. The two most important alkali metals are sodium and potassium.
Alkali Metals, series of six chemical elements in group 1 (or Ia) of the periodic table (see Periodic Law). They are soft compared to other metals, have low melting points, and are so reactive that they are never found in nature uncombined with other elements. They are powerful reducing agents, that is, they give up an electron easily, and react violently with water to form hydrogen gas and hydroxides, or strong bases. The alkali metals are, in order of increasing atomic number, lithium, sodium, potassium, rubidium, cesium, and francium. Francium exists only in a radioactive form.
ALKALINE EARTH METALS
Alkaline earth metals which is fairly hard, gray-white, and a good conductor of electricity. The two most common alkaline earth metals are magnesium and calcium.
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.
TRANSITION ELEMENTS
Transition Elements, series of chemical elements that share similar electron orbital structures and hence similar chemical properties. The transition elements are commonly defined as the 30 elements with atomic numbers 21 to 30, 39 to 48, and 71 to 80.
The transition elements exhibit multiple valences or oxidation states typically ranging from +1 to +8 in compounds. In organometallic compounds, consisting of metals bonded to organic species, transition metals sometimes take on negative oxidation states. The transition elements have such typical metallic properties as malleability, ductility, high conductivity of heat and electricity, and metallic luster. They tend to act as reducing agents (donors of electrons), but are less active in this regard than the alkali metals and alkaline earth metals, which have valences of +1 and +2, respectively. Transition elements in general have high densities and melting points and exhibit magnetic properties. They form both ionic and covalent bonds with anions (negatively charged ions), and such compounds are in general brightly colored.
The transition metals include iron, copper, nickel, silver, and gold. Transition metals are hard and shinny. Their good conductors of electricity and many of these metals form colorful compounds. Transition metals are important to our health.
THE END!THANKS FOR READING=DDD
WELL... VERY TIRED RIGHT?? IM TIRED TOO.. SO GO FOR A REST BA XDD
The transition metals include iron, copper, nickel, silver, and gold. Transition metals are hard and shinny. Their good conductors of electricity and many of these metals form colorful compounds. Transition metals are important to our health.
THE END!THANKS FOR READING=DDD WELL... VERY TIRED RIGHT?? IM TIRED TOO.. SO GO FOR A REST BA XDD
angel_fang423- Posts : 6
Join date : 2007-12-12
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