February 24, 2017

Homework Help: chemistry

Posted by me on Saturday, July 10, 2010 at 2:48am.

can anyone explain to me this i don't understand it.

Certain groups of different atoms will join together and act
as a single unit when forming compounds. Such a group
of atoms is called a radical. In the compound calcium
carbonate, written CaCO3, the carbonate group CO3 is
a radical. The carbonate group has a negative valence of 2,
and it combines directly with one atom of calcium, which
has a positive valence of 2. Some other examples of radicals
are sulfate (SO4
–2), nitrate (NO3
–1), hydroxide (OH–1), and
ammonium (NH4
If a subscript is needed with a radical, the symbol for the
radical is placed inside parentheses. Thus, the formula for
magnesium nitrate is written Mg(NO3)2.

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