Notes for metals and non metals class 8 I
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SOLUTION:-
Difference Between Metals And Nonmetals
Most of the elements around us are either metals or nonmetals.So, it is important to know whether a particular element is metal or nonmetal. Elements are distinguished as above based on their properties. Have a look at the differences.
Metals
Majority elements are metals. This includes alkaline earth metals, alkali metals, transition metals, actinides, and lanthanides. Metals are separated by nonmetals on a periodic table through a zigzag line starting from carbon, phosphorus, selenium, iodine, and radon. These elements and elements right to them in the periodic table are nonmetals. Elements present just to the left of the line are termed as semi-metals and metalloids. These will have the combined properties of both metals and nonmetals.
Physical properties of metals
Shiny (lustrous)
Good conductors of electricity and heat
High density
High melting point
Malleable
Ductile and so can be drawn into wires
Solid at room temperature except for mercury
Opaque objects
Chemical properties of metals
Easily corrodible
Can lose electrons
Form basic oxides
Have lower electronegativities
Acts as very good reducing agents
Nonmetals
Very few elements in the periodic table are nonmetals. These are present on the right side of the periodic table. Elements that come under nonmetals are hydrogen, carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, all the halogens, and the noble gases.
Physical properties of non-metals
Poor conductors of electricity and heat
Non-Ductile metals
Brittle solids
May be solids, liquids or gases at room temperature
These are not sonorous
Transparent
Chemical properties of non-metals
Generally, contain 4-8 electrons in the outer shell
Readily lose or gain valence electrons
Form acidic oxides
High electronegative elements
Great oxidizing agents
Both nonmetals and metals take different forms which have different shapes and properties compared to each other. For example, diamond and graphite are two allotropes of nonmetal carbon, whereas austenite and ferrite are two allotropes of iron.
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SOLUTION:-
Difference Between Metals And Nonmetals
Most of the elements around us are either metals or nonmetals.So, it is important to know whether a particular element is metal or nonmetal. Elements are distinguished as above based on their properties. Have a look at the differences.
Metals
Majority elements are metals. This includes alkaline earth metals, alkali metals, transition metals, actinides, and lanthanides. Metals are separated by nonmetals on a periodic table through a zigzag line starting from carbon, phosphorus, selenium, iodine, and radon. These elements and elements right to them in the periodic table are nonmetals. Elements present just to the left of the line are termed as semi-metals and metalloids. These will have the combined properties of both metals and nonmetals.
Physical properties of metals
Shiny (lustrous)
Good conductors of electricity and heat
High density
High melting point
Malleable
Ductile and so can be drawn into wires
Solid at room temperature except for mercury
Opaque objects
Chemical properties of metals
Easily corrodible
Can lose electrons
Form basic oxides
Have lower electronegativities
Acts as very good reducing agents
Nonmetals
Very few elements in the periodic table are nonmetals. These are present on the right side of the periodic table. Elements that come under nonmetals are hydrogen, carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, all the halogens, and the noble gases.
Physical properties of non-metals
Poor conductors of electricity and heat
Non-Ductile metals
Brittle solids
May be solids, liquids or gases at room temperature
These are not sonorous
Transparent
Chemical properties of non-metals
Generally, contain 4-8 electrons in the outer shell
Readily lose or gain valence electrons
Form acidic oxides
High electronegative elements
Great oxidizing agents
Both nonmetals and metals take different forms which have different shapes and properties compared to each other. For example, diamond and graphite are two allotropes of nonmetal carbon, whereas austenite and ferrite are two allotropes of iron.
======================================
kindly mark it as BRAINILEST ANSWER DEAR.......
======================================
HOPE THIS ANSWER HELPS YOU A LOT DEAR......
======================================
krishnasolanki21:
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