The transition metals take much longer to oxidize (such as iron, copper, zinc, nickel). Others, like palladium, platinum and gold, do not react with the atmosphere at all. Some metals form a barrier layer of oxide on their surface which cannot be penetrated by further oxygen molecules and thus retain their shiny appearance and good conductivity for many decades (like aluminium, some steels, and titanium). The oxides of metals are basic (as opposed to those of nonmetals, which are acidic), although this may be considered a rule of thumb, rather than a fact.
Painting, anodising or plating metals are good ways to prevent their corrosion. However, a more reactive metal in the electrochemical series must be chosen for coating, especially when chipping of the coating is expected. Water and the two metals form an electrochemical cell, and if the coating is less reactive than the coatee, the coating actually promotes corrosion.
Physical Properties of MetalsTraditionally, metals have certain characteristic physical properties: they are usually shiny (they have metallic luster), have a high density, are ductile and malleable, usually have a high melting point, are usually hard, are usually a solid at room temperature and conduct electricity, heat and sound well. While there are several metals that are low density, soft, and have low melting points, these (the alkali and alkaline earth metals) are extremely reactive, and are rarely encountered in their elemental, metallic form.The electrical and thermal conductivity of metals originate from the fact that in the metallic bond the outer electrons of the metal atoms form a gas of nearly free electrons, moving as an electron gas in a background of positive charge formed by the ion cores. Good mathematical predictions for electrical conductivity, as well as the electrons' contribution to the heat capacity and heat conductivity of metals can be calculated from the free electron model, which does not take the detailed structure of the ion lattice into account.
When considering the exact band structure and binding energy of a metal, it is necessary to take into account the positive potential caused by the specific arrangement of the ion cores - which is periodic in crystals. The most important consequence of the periodic potential is the formation of a small band gap at the boundary of the brillouin zone. Mathematically, the potential of the ion cores is treated in the nearly-free electron model.
Non-metalsNon-metal is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, every element in the periodic table can be termed either a metal or a non-metal. (A few elements with intermediate properties are referred to as metalloids.) MetalloidsMetalloid is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, nearly every element in the periodic table can be termed either a metal or a nonmetal - however a few elements with intermediate properties are referred to as metalloids. (In Greek metallon = metal and eidos = sort)There is no rigorous definition of the term, however the following properties are usually considered characteristic of metalloids:
The concepts of metalloid and semiconductor should not be confused. Metalloid refers to the properties of certain elements in relation to the periodic table. Semiconductor refers to the physical properties of materials (including alloys, compounds) and there is only partial overlap between the two.
The following elements are generally considered metalloids:[1]
Some allotropes of elements exhibit more pronounced metal, metalloid or non-metal behavior than others. For example, for the element carbon, its diamond allotrope is clearly non-metallic, however the graphite allotrope displays limited electric conductivity more characteristic of a metalloid. Phosphorus, tin, selenium and bismuth also have allotropes which display borderline behavior.
In the standard layout of the periodic table, metalloids occur along the diagonal line through the p block from boron to astatine. Elements to the upper right of this line display increasing nonmetallic behaviour; elements to the lower left display increasing metallic behaviour. This line is called the "stair-step" or "staircase." The poor metals are to the left and down and the nonmetals are to the right and up. In addition, the halogens are found at the right.
What is the question. Question needs rephrasing by initiating contributor
The metalloids have properties of both metals and nonmetals.
Elements that have properties of both metals and nonmetals are classified as metalloids. Metalloids have properties that are intermediate between metals and nonmetals, such as being able to conduct electricity but not as effectively as metals. Examples of metalloids include silicon and arsenic.
Metals are good conductors of heat and electricity, while nonmetals are poor conductors. Metalloids have properties that are intermediate between metals and nonmetals.
alloy
An element that has properties of both metals and non-metals is called Metalloid. Example is Germanium.
because metalloids usually have properties that are similar to metals and nonmetals
The metalloids have properties of both metals and nonmetals.
Elements that have properties of both metals and nonmetals are classified as metalloids. Metalloids have properties that are intermediate between metals and nonmetals, such as being able to conduct electricity but not as effectively as metals. Examples of metalloids include silicon and arsenic.
Metalloids have properties of both metals and nonmetals. They can conduct electricity like metals but are brittle like nonmetals. Some examples of metalloids are silicon and germanium.
No, metalloids have properties of metals and nonmetals.
Those elements are called metalloids. They have properties that are intermediate between metals and nonmetals.
i think they have properties of both metals and nonmetals .
Metalloids
The three classes of elements are metals, nonmetals, and metalloids. Metals are typically shiny, solid at room temperature, and good conductors of heat and electricity. Nonmetals are usually dull in appearance, brittle, and poor conductors of heat and electricity. Metalloids have properties that are intermediate between metals and nonmetals.
Yes, metalloids are elements that have properties of both metals and nonmetals.
Metalloids do not contain either metals or nonmetals. They are elements that have properties of both metals and metalloids, and are found between the metals and nonmetals on the periodic table.
Elements can be classified into metals, nonmetals, and metalloids based on their properties. Metals are typically shiny, malleable, and good conductors of heat and electricity. Nonmetals are typically dull, brittle, and poor conductors. Metalloids have properties that are intermediate between metals and nonmetals.