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Group 2A - 2 aq H 2 g The tendency of the alkaline earths...

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Group 2A: The Alkaline Earth Metals 2A 4 Be 12 Mg 20 Ca 38 Sr 56 Ba 88 Ra Compared with the alkali metals, the alkaline earth metals are typically: harder more dense melt at a higher temperature The first ionization values (I 1 ) of the alkaline earth metals are not as low as the alkali metals: the alkaline earth metals are therefore less reactive than the alkali metals (Be and Mg are the least reactive of the alkaline earth metals) Calcium, and elements below it, react readily with water at room temperature: Ca( s ) + 2H 2 O( l ) -> Ca(OH)
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Unformatted text preview: 2 ( aq ) + H 2 ( g ) The tendency of the alkaline earths to lose their two valence electrons is demonstrated in the reactivity of Mg towards chlorine gas and oxygen: Mg( s ) + Cl 2 ( g ) -> MgCl 2 ( s ) 2Mg( s ) + O 2 ( g ) -> 2MgO( s ) The 2+ ions of the alkaline earth metals have a noble gas like electron configuration and are thus form colorless or white compounds (unless the anion is itself colored). Flame colors: • Calcium: brick red • Strontium: crimson red • Barium: green...
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