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nonmetallic element
subject			fact

nonmetallic element	is a kind of element
element	is a part of Universe
	has synonym atom
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 nonmetallic element :

• carbon (5 kinds, 158 facts) (C, ³P₀ in ground state) - pure forms occur as graphite, diamond and buckminsterfullerene C₆₀
• halogen (16 kinds, 314 facts) (group VII element)
• hydrogen (3 kinds, 153 facts) (H, ²S_1/2 in ground state) - Colourless, odourless gas, insuluable in water. Lightest, most abundant element in the Universe. Its atom comprises one proton and one electron. The element occurs both in stars and as interstellar clouds, in regions where it may be neutral (H I regions) or ionized (H II regions). It was produced by the big bang. Hydrogen 1 is the most common isotope; deuterium, is rarer; and tritium, is radioactive.,
• inert gas (23 kinds, 395 facts) (group VIII element, noble gas)
• nitrogen (5 kinds, 134 facts) (N, ⁴S_3/2 in ground state) - colourless, odourless gas (N₂)
• nonmetal
• oxygen (5 kinds, 125 facts) (O, ³P₂ in ground state) - colourless, odourless gas (O₂) which is very reactive
• phosphorus (4 kinds, 135 facts) (P, ⁴S_3/2 in ground state) - soft and flammable white solid, the red form is usually non-flammable
• selenium (7 facts)
• sulfur (7 kinds, 150 facts) (S, ³P₂ in ground state) - the α-S₈ orthorhombic form of sulfur is yellow

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