Unformatted text preview: se electrons to become positive ions.
⇒ This happens to the s-block elements (main group metal
ions). • Examples include K + , Ca2+
NOTE: Aluminium also does this: Al 3+ .
y Gain electrons (p-block elements) to become negative ions
⇒ This happens in the 16 and 17 groups
• Examples include Cl − , S−2 . NOTE: ions with charge of −3 do exist, but are rare.
NOTE: Some of these ions play an important rôle in
biochemistry. EXAMPLE: The Calcium ion Ca2+ is required for many
biological processes (signal transduction) including • neuron ﬁring via the synapse. Neurons are cells that process
information in the nervous system of the body. • Blood clotting
• Muscle contraction
• See the Calcium video http://www.periodicvideos.com/videos/020.htm...
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