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physical object > natural object > particle > element > column grouped element > alkali metal

alkali metal (group I element)
subject			fact

alkali metal	has group 1
	reacts with water vigorously
	has hardness soft
	has appearancee silvery except for francium
	has synonym group I element
	has definition Metal in the first column of the periodic table
	is a kind of metallic 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 alkali metal :

• cesium (5 facts)
• francium (2 facts)
• lithium (4 kinds, 132 facts) (Li, ²S_1/2 in ground state) - Soft, silvery-white, metal. Lightest of all solid elements, third in the periodic table after hydrogen and helium. Its atom comprises one proton and three electrons. One of the electrons is at a higher energy level than the other two. Some lithium formed in the big bang, along with huge amounts of hydrogen and helium.
• potassium (8 kinds, 177 facts) (K, ²S_1/2 in ground state, kalium from Greek) - soft white metal which is silvery when first cut but oxidizes rapidly in air
• rubidium (5 facts)
• sodium (3 kinds, 118 facts) (Na, ²S_1/2 in ground state, natrium from Latin) - soft, silvery-white metal which oxidizes rapidly when cut

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