(a) What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
(b) Classify the following into metals, non-metals and metalloids :
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.
(a) What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
(b) Classify the following into metals, non-metals and metalloids :
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.
(a)
Most
element are metals. They are usually shiny, very dense, and only melt at high temperatures. Their shape can be easily changed into thin wires or sheets without breaking. Metals will corrode, gradually wearing away, like rusting iron. Heat and electricity travel easily through metals, which is why it is not wise to stand next to a flagpole during a thunderstorm!
Nonmetals, on the right side of the periodic table, are very different from metals. Their surface is dull and they don’t conduct heat and electricity. As compared to metals, they have low density and will melt at low temperatures. The shape of nonmetals cannot be changed easily because they are brittle and will break.
Elements that have properties of both metals and nonmetals are called metalloids. They can be shiny or dull and their shape is easily changed. Electricity and heat can travel through metalloids but not as easily as they travel through metals.
Example:-
Metals are the substances which lose electrons to form positive ions . for eg. sodium, magnesium.
Non metals are the substances which gain electrons to form negative ions for eg. oxygen , nitrogen.
Metalloidew are the substances which show the property of both metals and non metals for eg. silicon,germanium.
(b)
Metals :- Mercury, Sodium, Magnesium and Copper
Non-metal :- Diamond, Sulphur, Iodine, Carbon and Helium
Metalloids :- Silicon, Boron and Germanium.
(a)
Most
element are metals. They are usually shiny, very dense, and only melt at high temperatures. Their shape can be easily changed into thin wires or sheets without breaking. Metals will corrode, gradually wearing away, like rusting iron. Heat and electricity travel easily through metals, which is why it is not wise to stand next to a flagpole during a thunderstorm!
Nonmetals, on the right side of the periodic table, are very different from metals. Their surface is dull and they don’t conduct heat and electricity. As compared to metals, they have low density and will melt at low temperatures. The shape of nonmetals cannot be changed easily because they are brittle and will break.
Elements that have properties of both metals and nonmetals are called metalloids. They can be shiny or dull and their shape is easily changed. Electricity and heat can travel through metalloids but not as easily as they travel through metals.
Example:-
Metals are the substances which lose electrons to form positive ions . for eg. sodium, magnesium.
Non metals are the substances which gain electrons to form negative ions for eg. oxygen , nitrogen.
Metalloidew are the substances which show the property of both metals and non metals for eg. silicon,germanium.
(b)
Metals :- Mercury, Sodium, Magnesium and Copper
Non-metal :- Diamond, Sulphur, Iodine, Carbon and Helium
Metalloids :- Silicon, Boron and Germanium.
