An element is the simplest type of issue that can not be split into simpler substances or constructed from simpler substances by any type of ordinary yellowcomic.comical or physical method. There space 110 elements known come us, out of i m sorry 92 are normally occurring, while the rest have actually been all set artificially. Elements are more classified right into metals, non-metals, and also metalloids.
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Distinguishing luster (shine)
Non-lustrous, various colors
Malleable and also ductile (flexible) as solids
Brittle, difficult or soft
Conduct heat and electricity
Metallic oxides space basic, ionic
Nonmetallic oxides are acidic, compounds
Cations in aqueous solution
Anions, oxyanions in aqueous solution
All aspects except hydrogen, which form positive ion by shedding electrons throughout yellowcomic.comical reaction are called metals. Therefore metals are electropositive elements. Lock are identified by glowing luster, hardness, capability to resonate sound and also are excellent conductors of heat and also electricity. Steels are solids under normal problems except because that Mercury.
Physical nature of Metals
Metals room lustrous, malleable, ductile, an excellent conductors the heat and electricity. Other properties include:State: metals are solids at room temperature v the exemption of mercury, i m sorry is liquid at room temperature (Gallium is fluid on warm days). Luster: Metals have the high quality of reflecting light indigenous its surface and also can be polished e.g., gold, silver and also copper. Malleability: Metals have actually the capacity to resist hammering and can be made into thin sheets recognized as foils (a sugar cube chunk of gold deserve to be pounded into a slim sheet which will certainly cover a soccer field). Ductility: Metals have the right to be attracted into wires. 100 gm the silver can be attracted into a thin wire about 200 meters long. Hardness: All steels are hard other than sodium and also potassium, which room soft and also can be reduced with a knife. Valency: Metals have actually 1 to 3 electron in the outermost covering of your atoms. Conduction: steels are an excellent conductors due to the fact that they have cost-free electrons. Silver and copper space the two best conductors the heat and also electricity. Command is the poorest conductor the heat. Bismuth, mercury and iron are likewise poor conductors Density: Metals have high density and are really heavy. Iridium and osmium have actually the highest possible densities where as lithium has actually the lowest density. Melting and Boiling Points: Metals have actually high melting and also boiling point. Tungsten has actually the highest possible melting point where as silver has actually low boil point. Sodium and also potassium have actually low melt points.
yellowcomic.comical nature of Metals
Metals space electropositive aspects that generally form basic or amphoteric oxides with oxygen. Various other yellowcomic.comical nature include:Electropositive Character: metals tend to have actually low ionization energies, and also typically lose electrons (i.e. Space oxidized) as soon as they experience yellowcomic.comical reactions They normally do not accept electrons. For example:
Alkali metals are constantly 1+ (lose the electron in s subshell) Alkaline planet metals are always 2+ (lose both electrons in s subshell) transition metal ions do not follow an obvious pattern, 2+ is common, and 1+ and 3+ are also observed link of steels with non-metals have tendency to it is in ionic in nature Most metal oxides are straightforward oxides and also dissolve in water to type metal hydroxides:
Metal oxide + water -> steel hydroxide
Na2O(s) + H2O(l) -> 2NaOH(aq)
CaO(s) + H2O(l) -> Ca(OH)2(aq)steel oxides exhibit your basic yellowcomic.comical nature by reacting v acids to form salts and also water:
Metal oxide + mountain -> salt + water
MgO(s) + HCl(aq) -> MgCl2(aq) + H2O(l)
NiO(s) + H2SO4(aq) -> NiSO4(aq) + H2O(l)
What is the yellowcomic.comistry formula for aluminum oxide?
Al has actually 3+ charge, the oxide ion is O2-, for this reason Al2O3
Would you mean it to be solid, liquid or gas at room temp?
Oxides of metals are characteristically solid in ~ room temp
Write the balanced yellowcomic.comical equation because that the reaction of aluminum oxide through nitric acid:
Metal oxide + acid -> salt + water
Al2O3(s) + 6HNO3(aq) -> 2Al(NO3)3(aq) + 3H2O(l)
Elements that have tendency to acquire electrons to form anions during yellowcomic.comical reactions are dubbed non-metals. These are electronegative elements. They space non-lustrous, brittle and also poor conductors the heat and electricity (except graphite). Non-metals deserve to be gaseous, liquids or solids.
Physical nature of nonmetals:Physical State: many of the non-metals exist in 2 of the three states of matter at room temperature: gases (oxygen) and solids (carbon). Non-Malleable and also Ductile: Non-metals are an extremely brittle, and cannot it is in rolled into wires or pounded right into sheets. Conduction: they are negative conductors that heat and electricity. Luster: These have no metallic luster and also do no reflect light Conductivity: poor conductors of heat and also electricity Melting and also Boiling Points: The melt points that non-metals space generally lower than metals Seven non-metals exist under standard problems as diatomic molecules: H2(g) N2(g) O2(g) F2(g) Cl2(g) Br2(l) I2(l) (volatile liquid - evaporates readily)
yellowcomic.comical nature of NonmetalsNon-metals have a tendency to acquire or share electron with other atoms. They are electronegative in character. Nonmetals, when reacting with metals, tend to gain electrons (typically attaining noble gas electron configuration) and also become anions:
Nonmetal + metal -> Salt
<3Br_2(l) + 2Al_(s) ightarrow 2AlBr_3(s)>compounds composed entirely of nonmetals room molecular substances (not ionic). Castle generally kind acidic or neutral oxides with oxygen the that dissolve in water react to type acids:
Nonmetal oxide + water -> acid
(carbonated water is slightly acidic)Nonmetal oxides can incorporate with bases to form salts.
Nonmetal oxide + base -> salt
Properties intermediate in between the metals and also nonmetals. Metalloids are beneficial in the semiconductor industry.
Physical nature of MetalloidsState: They space all solid in ~ room temperature. Conduction: some metalloids, such as silicon and germanium, deserve to act as electrical conductors under the best conditions, hence they are called semi-conductors.
Luster: Silicon because that example shows up lustrous, however is not malleable or ductile (it is brittle - a characteristics of some nonmetals). That is a lot poorer conductor of heat and also electricity than the metals.Solid Solutions: castle can kind alloys with various other metals.
yellowcomic.comical properties of Metalloidsyour physical properties tend to be metallic, yet their yellowcomic.comical properties have tendency to be non-metallic. The oxidation number of an facet in this group can range from +3 come -2, depending on the group in which it is located.
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Trends in Metallic and also Nonmetallic Character
Metallic character is strongest for the facets in the leftmost part of the regular table, and also tends to decrease together we move to the right in any duration (nonmetallic character rises with enhancing ionization values). Within any group of elements (columns), the metallic character rises from optimal to bottom (the ionization values typically decrease together we relocate down a group). This general trend is not have to observed through the transition metals.