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Metals versus Non-metals

The Periodic Table is arranged with metals on the left
side and non-metals on the right side. The only
exception is hydrogen, which is on the left side, but acts
like a non-metal.

The metals and non-metals are divided by the staircase
of metalloids.
Metals
Non-metals
Have a high lustre
 Ductile and
malleable
 High electrical
conductivity
 All solid except
Mercury; Mercury
is a liquid


Have a dull lustre
 Not malleable
Poor conductors of
electricity
 Some are gases,
brittle solids, and
Br is liquid at room
temperature

Metalloids
Elements that rest on each side of
the staircase.
 Have properties of both metals and
non-metals.
 Example: Silicon – some ability to
conduct electricity (used in
transistors and chips).

Alkali Metals

Alkali Metals are the most reactive metals
and thus do not exist by themselves in
nature.
Alkaline Earth Metals

Alkaline Earth Metals are very
reactive metals that are also not
found free in nature.
Halogens
 Halogens
metals.
are the most active non-
Nobel Gases

Noble Gases are colourless gases that
are extremely unreactive. They never
(or very rarely) form compounds with
other elements.