Definition of metal non metals and metalloids for class 11
Dear Student,,
The elements in the periodic table can also be divided according to whether they are metals, metalloids or non-metals.
METALS :- Metals comprise more than 78% of all known elements and appear on the left side of the Periodic Table. Metals are usually solids at room temperature;mercury is an exception; gallium and caesium also have very low melting points (303K and 302K, respectively). Metals usually have high melting and boiling points. They are good conductors of heat and electricity. They are malleable which means can be flattened into thin sheets by hammering and ductile which means can be drawn into wires.
NON-METALS :- Non-metals are located at the top right hand side of the Periodic Table. In fact, in a horizontal row, the property of elements change from metallic on the left to non-metallic on the right. Non-metals are usually solids or gases at room temperature with low melting and boiling points (boron and carbon are exceptions). They are poor conductors of heat and electricity. Most nonmetallic solids are brittle and are neither malleable nor ductile.noble gases and halogens are also nonmetals The elements become more metallic as we go down a group; the nonmetallic character increases as one goes from left to right across the Periodic Table.Elements that come under nonmetals are sulfur, carbon, all halogens, phosphorus, hydrogen, oxygen, selenium, nitrogen, and noble gases.
METALLOIDS :- A metalloid is a chemical element that exhibits some properties of metals and some of nonmetals.The elements e.g., silicon, germanium, arsenic, antimony and tellurium bordering the line and running diagonally across the Periodic Table show properties that are characteristic of both metals and nonmetals. These elements are called Semi-metals or metalloids.
Regards.
The elements in the periodic table can also be divided according to whether they are metals, metalloids or non-metals.
METALS :- Metals comprise more than 78% of all known elements and appear on the left side of the Periodic Table. Metals are usually solids at room temperature;mercury is an exception; gallium and caesium also have very low melting points (303K and 302K, respectively). Metals usually have high melting and boiling points. They are good conductors of heat and electricity. They are malleable which means can be flattened into thin sheets by hammering and ductile which means can be drawn into wires.
NON-METALS :- Non-metals are located at the top right hand side of the Periodic Table. In fact, in a horizontal row, the property of elements change from metallic on the left to non-metallic on the right. Non-metals are usually solids or gases at room temperature with low melting and boiling points (boron and carbon are exceptions). They are poor conductors of heat and electricity. Most nonmetallic solids are brittle and are neither malleable nor ductile.noble gases and halogens are also nonmetals The elements become more metallic as we go down a group; the nonmetallic character increases as one goes from left to right across the Periodic Table.Elements that come under nonmetals are sulfur, carbon, all halogens, phosphorus, hydrogen, oxygen, selenium, nitrogen, and noble gases.
METALLOIDS :- A metalloid is a chemical element that exhibits some properties of metals and some of nonmetals.The elements e.g., silicon, germanium, arsenic, antimony and tellurium bordering the line and running diagonally across the Periodic Table show properties that are characteristic of both metals and nonmetals. These elements are called Semi-metals or metalloids.
Regards.