Please enable JavaScript.
Coggle requires JavaScript to display documents.
METALS AND NON-METAS - Coggle Diagram
METALS AND NON-METAS
-
-
METALLOIDS
have properties of both metals and non-metals eg silicon, germanium and arsenic
PHYSICAL PROPERTIES
Metals
- state- solid at room temperature
-
- lustre- shining surface. this property is called metallic lustre
- high melting and boiling pt.
-
- malleablle ie can be beaten into thin sheets
- ductile ie can be drawn into wires
- sonorous ie produce a ringing sound when struck against a hard object
- good conductors of heat and electricity
- silver and grey color (mostly)
exeptions
-
- metals having low melting pt.- gallium and caesium (melt if you keep them on your palm
- soft metals- alkalis metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. they have low densities and low melting pt.
- most malleable metal- gold (then silver)
-
- metals which are bst conductors of heat- silver and copper
- metals which are poor conductors of heat- lead and mercury
-
- non-metal which is a good conductor of electricity- graphite
- lustrous non-metal- iodine and graphite
- non-melting having high melting pt.- diamond
- liquid non-metal- bromine
- most abundant metal on earth's crust- aluminium
- most abundant non-metal on earth's crust- oxygen
- non-metal which are both brittle and non-ductile- phosphorus and sulphur
- metal that is the best conductor of heat and electricity- silver
- metals having density less than 1 gcm-3- sodium and potassium
- non-metals which are brittle solids- sulphur and carbon
-
in total 118 elements have been identified. the 1st 94 occur naturally on earth, and the remaining 24 are synthetic elements