The ninth group consists of the poor metals. These metals are different from the metals in the
fourth group because these metals are soft. These metals melt easily. They also mix well with other
metals to form alloys. Both lead and aluminum are poor metals.
The last group consists of the semi–metals. The members of this group are like metals in some
ways. They are also like non–metals in some ways. Some semi–metals are arsenic and bismuth.
Depending on which other substances touch them, they can be conductors of electricity or they can
insulate, or protect, substances from electricity. Some scientists call the semi–metals “double metals”
because of their structure.