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physical object > natural object > particle > element > column grouped element > halogen

halogen (group VII element)
subject			fact

halogen	has group 17
	has synonym group VII element
	is a kind of nonmetallic element
	is a kind of column grouped element
element	is a part of Universe
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of halogen :

• astatine (2 facts)
• bromine (7 facts)
• chlorine (7 kinds, 162 facts) (Cl, ²P_3/2 in ground state) - yellow-green, dense, sharp-smelling gas (Cl₂) which is a key industrial chemical
• fluorine (4 kinds, 133 facts) (F, ²P_3/2 in ground state) - pale yellow gas (F₂) which is the most reactive of all the elements, and is the strongest oxidizing agent
• iodine (6 facts)

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