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radioactive element
subject			fact

radioactive element	has definition an unstable radioactive element which has an excess or deficit of neutron relative to the stable element
	is a kind of element
	is a kind of radioactive particle
radioactive particle	has desintegration energy the total energy produced when the particle decays
	has decay products the products produced immediately after decay
	has lifetime The average time in which a particle decays
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 radioactive element :

• actinium (6 kinds, 128 facts) (Ac, Ac, ²D_3/2 in ground state) - soft, silvery-white, radioactive metal which glows in the dark
• americium (10 kinds, 171 facts) (Am, ⁸S_7/2 in ground state) - radioactive silvery metal which does not occur naturally
• supernova produced radioactive element (1 kind, 17 facts) - a radioactive element produced within the core of an exploding supernova

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