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physical object > natural object > particle > element > metallic element > alkali earth metal

alkali earth metal
subject			fact

alkali earth metal	has hardness malleable, extrudable and machinable
	has definition Element in the second column of the periodic table (from the left)
	is a kind of metallic 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 alkali earth metal :

• barium (5 facts)
• beryllium (8 kinds, 163 facts) (Be, ¹S₀ in ground state) - Silvery-white, lustrous, relatively soft metal which is unaffected by air or water, even at red heat. Rare and fragile element. Nuclear reactions in stars destroy it. Most and possibly all beryllium originated when cosmic rays smashed into heavier atoms in space and split them into lighter ones, such as beryllium.
• calcium (10 kinds, 185 facts) (Ca, ¹S₀ in ground state) - silvery-white, relatively soft metal
• magnesium (6 kinds, 140 facts) (Mg, ¹S₀ in ground state) - silvery white, lustrous and relatively soft metal
• radium (4 facts)
• strontium (5 facts)

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