The metal elements are on the left of a ‘stepped line’ that runs below boron (B), silicon (Si), arsenic (As), tellurium (Te), and astatine (At).
You can tell the difference between the metals and non-metals by looking at their properties.
|Properties of a typical metal in a solid state||Properties of a typical non-metal in a solid state|
|Good conductor of electricity||Poor conductor of electricity|
|Good conductor of heat||Poor conductor of heat|
|Generally high melting points||Generally low melting points|
|Malleable (can be hammered into shape)||Brittle (breaks when hammered)|
|Ductile (can be drawn out into wires)||Brittle (snaps when stretched)|
|Sonorous (makes a ringing sound when struck)||Not sonorous|
At room temperature:
Elements in the same group have the same number of electrons in their outer shell, which means they have similar chemical properties
|Group||Name||Metal / Non-metal||Reactive / Non-reactive|
|2||alkaline earth metals||metal||reactive|