Halogens Group 17 7 electrons in the outer shell All are non- metals Very reactive are often bonded with elements from Group 1 Color the Halogens.

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Presentation transcript:

Halogens Group 17 7 electrons in the outer shell All are nonmetals Very reactive are often bonded with elements from Group 1 Color the Halogens

Halogens Elements in group 17 Very reactive, volatile, diatomic, nonmetals Always found combined with other element in nature. Used as disinfectants and to strengthen teeth.

Noble Gases Group 18 Exist as gases Non-metals 8 electrons in the outer shell = Full Helium (He) has only 2 electrons in the outer shell = Full Not reactive with other elements Color the noble gases

The Noble Gases Elements in group 18 VERY unreactive, monatomic gases Used in lighted “neon” signs Used in blimps to fix the Hindenberg problem. Have a full valence shell.