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Transcript of Periodic Table
elements are arranged in a series of rows (or periods) so that those with similar properties appear in a column. Elements of the same period have the same number of electron shells
a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups
*All of the halogens form acids when bonded to hydrogen
*Halogens are very toxic
*Oxidation # is -1
*7 Electrons in outer shell
*In group 1
*1 electron in the outer shell
Alkaline Earth Metals
*Oxidation # is 2
*Ductile and malleable
*OXIDATION # IS 0
*They are all stable
The valence electrons are the electrons in the last shell or energy level of an atom. They do show a repeating or periodic pattern. The valence electrons increase in number as you go across a period. Then when you start the new period, the number drops back down to one and starts increasing again.
Oxygen has 6 valence electrons