Examples of metals: iron, copper, gold, aluminium, silver, calcium etc. Solid non-metals are soft and dull. They break down into a powdery mass on tapping with a hammer. For example, coal and sulphur.
Physical properties of metals include:
- Corrosion resistance.
- Density.
- Melting point.
- Thermal properties.
- Electrical conductivity.
- Magnetic properties.
A metal can refer to an element, compound, or alloy that is a good conductor of both electricity and heat. Example metals include gold, sodium, copper, iron, and many other elements. Metals are usually malleable, ductile, and shiny.
Metals are shiny because they have a lot of free (i.e. delocalized) electrons that form a cloud of highly mobile negatively charged electrons on and beneath the smooth metal surface in the ideal case.
Five common metals are copper, lead, tin, nickel, and zinc. Four common nonmetals are sulfur nitrogen, selenium, and bromine. The seven metalloids are boron, silicon, germanium, arsenic, antimony, tellurium, and polonium. The three types of elements occupy their own places in the Periodic Table.
What are the major differences between metals and non-metals?
| METALS | NON METALS |
|---|
| Metals are less electronegative. They are rather electropositive elements. | Non–metals are electronegative. |
| Metals have a high reducing power. | Non–metals have a low reducing power |
Summary of Common Properties
- High ionization energies.
- High electronegativities.
- Poor thermal conductors.
- Poor electrical conductors.
- Brittle solids—not malleable or ductile.
- Little or no metallic luster.
- Gain electrons easily.
- Dull, not metallic-shiny, although they may be colorful.
The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust. The metal is trimorphic, harder than sodium, but softer than aluminium.
Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.
Metal is a solid material which conduct heat & electricity ,hard, shiny, malleable, fusible, and ductile. Nonmetal is a substance that do not exhibit properties of metals such as hardness, luster, malleability ,ductility and the ability to conduct electricity.
Silicon is neither metal nor non-metal; it's a metalloid, an element that falls somewhere between the two. The category of metalloid is something of a gray area, with no firm definition of what fits the bill, but metalloids generally have properties of both metals and non-metals.
The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability that are characteristic of metals. Each alkali metal atom has a single electron in its outermost shell.
1 of a metal : capable of being drawn out (see draw entry 1 sense 15) into wire or thread ductile iron.
Properties of Metals
- Metals have relatively high melting points. This explains why all metals except for mercury are solids at room temperature.
- Most metals are good conductors of heat.
- Metals are generally shiny.
- The majority of metals are ductile.
- Metals tend to be malleable.
Metals, Metalloids, and Nonmetals. The elements can be classified as metals, nonmetals, or metalloids. Metals are good conductors of heat and electricity, and are malleable (they can be hammered into sheets) and ductile (they can be drawn into wire).
They are usually in the form of a solid at room temperature. They are very good conductors of electricity and heat. Metals are malleable and ductile. They mostly have a very high melting point.
