Classification of elements

Classification of elements - Classification of elements...

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Classification of elements periodic table compactly shows relationships between elements features of the periodic table o Periods are horizontal rows on the table. o Groups (or families) are columns on the table. elements in the same group are called congeners. They have similar chemical properties. o Blocks are regions on the table. important groups: o alkali metals (Group IA, first column ) soft, extremely reactive metals react with cold water to form hydrogen gas form +1 ions o alkaline earth metals (Group IIA, second column): soft, reactive metals compounds are a major component of earth's crust form +2 ions o halogens (Group VIIA, next-to-last column): poisonous and extremely reactive nonmetals fluorine and chlorine are yellow-green gases bromine is a volatile red-brown liquid iodine is a volatile blue black solid all form -1 ions o noble gases (Group 0, last column) all are monatomic gases a. k. a. inert gases; almost completely unreactive
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Classification of elements - Classification of elements...

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