Gold : metal :: Silicon : _____
Gold is metal and Silicon is a metalloid. Those elements that shows the property of both metal and non-metal are called metalloids.
Mineral is :
Mineral is a naturally occurring material obtained from earth crust. Mineral contain one or more element.
Non metal that conducts electricity is :
Non-metal are generally bad conductors of electricity but Graphite is an allotrope of carbon which is a good conductor of electricity.
Metals are :
Metals are electropositive because metals contain 1,2 or 3 electron in outermost shell. Metals form electrovalent bond by loosing electron to become electropositive.
Rust formation is called :
Formation of rust on metal surface like iron is also called as corrosion. Corrosion occurs in presence of water and oxygen.
A metal is characterised by :
Metal is characterised by high electrical conductivity. Metals are malleable, ductile, sonorous and good conductor of heat and electricity.
Non metals occur as:
Non-metals are found in nature in solid, liquid and gaseous state. On the other hand metals are found in solid state except mercury that is liquid at room temperature.
Metals that react with both acids and bases are called:
Metals that reacts with both acids and bases are called amphoteric. Amphoteric oxides are acidic as well as basic in nature.
Metalloids are also known as :
Those elements that show the property of both metal and non-metal both are called metalloid or semi metals. Silicon, germanium etc are common metalloid.
Metals are solid except:
All metals are found in solid state at normal room temperature except mercury, which is liquid at room temperature.