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element (atom)
subject			fact

element	is a part of Universe
	has synonym atom
	has definition Different elements are distinguished by the number of protons in their nuclei. All hydrogen atoms have one proton; all helium atoms have two protons; all oxygen atoms have eight protons.
	has definition The smallest component of matter that retains its chemical properties. An atom consists of a nucleus and at least one electron.
	has definition The building block of matter. The nucleus of an atom consists of one or more protons and may contain neutrons as well; any electrons surround the nucleus. The number of protons in the atom - the atomic number - determines the element.
	has definition The fundamental unit of a chemical element. An atom consists of a nucleus, which may contain protons and neutrons, and electrons, which occupy shells that surround the nucleus and are centered on it.
	is a kind of particle
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 element :

• column grouped element (288 kinds, 4354 facts)
• gaseous element (53 kinds, 1104 facts)
• light element (30 kinds, 712 facts) - In astronomy these elements are hydrogen, helium, and lithium; sometimes also beryllium and boron.
• liquid element (2 kinds, 15 facts) - element which is in liquid form at standard temperature and pressure
• metallic element (207 kinds, 2775 facts)
• metalloid element (37 kinds, 659 facts)
• nonmetallic element (78 kinds, 1573 facts)
• planetary element (273 kinds, 4654 facts) - an element which occurs in certain parts of planets with varying concentration
• radioactive element (20 kinds, 319 facts) - an unstable radioactive element which has an excess or deficit of neutron relative to the stable element
• supernova produced element (4 kinds, 32 facts) - element heavier than iron produced within the core of an exploding supernova
• synthetic element (34 kinds, 210 facts) - element which cannot be found as a mineral deposit

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