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Group 1 ­ the alkali metals
Contains the familiar reactive metals sodium and potassium as well as others
Francium at the bottom is radioactive. One of its isotopes is produced in radioactive decay of
uranium but is short-lived.
Using the rest of Group 1 you can predict its properties but…

Page 2

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Potassium's reaction is faster than sodium's. Enough heat is produced to ignite the hydrogen
which burns with a lilac flame. The reaction often ends with the potassium spitting around. As
you go down the group, the metals become more reactive.

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