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Periodic table - Coggle Diagram
Periodic table
Group 8: The noble gases
What are they?
This group of non-metals contains the elements helium, neon, argon, krypton and xenon .
These elements are all: non-metals, colorless gases, which occur naturally in the air, monatomic - they exist as single atoms and unreactive
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Uses of the noble gas
Helium is used to fill balloons and airship, because it is lighter than the air and will not catch the fire.
Argon is used to provide an inert atmosphere.
- as a filler in tungsten light bulbs
- to protect metals that are being welded. because it won't react with the hot metals
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Xenon is used in lighthouse lamps, light for hospital operating rooms, and car headlamps.
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Group 7: The halogens
What are they?
Group 7 is a group of non-metal elements. They usually called halogens.
They all: Form colored gases. Fluorine is a pale yellow gas and chlorine is a green gas. Bromine forms a red vapor, and iodine a purple vapor, are poisonous and form diatomic molecules (containing two atoms)
Physical properties
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Boiling point and melting point is increasing from the top to the bottom is because the molecules become larger. the intermolecular forces become stronger, so small amount of heat energy is needed to overcome it during melting or boiling.
Chemical properties
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Reactivity decreases as you ho down the group because atomic radius increases in size with an increase of electronic energy levels, so it lessens the attraction for valence electrons of other atoms, decreasing reactivity.
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