Group Trend1 - Group Trends: The Active Metals Group 1A:...

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Group Trends: The Active Metals Group 1A: The Alkali Metals 1A 3 Li 11 Na 19 K 37 Rb 55 Cs 87 Fr The word "alkali" is derived from an Arabic word meaning "ashes". Many sodium and postassium compounds were isolated from wood ashes (Na 2 CO 3 and K 2 CO 3 are still occasionally referred to as "soda ash" and "potash"). As we move down the group (from Li to Fr) we find the following trends: All have a single electron in an 's' valence orbital The melting point decreases The density increases The atomic radius increases The ionization energy decreases (first ionization energy) The alkali metals have the lowest I 1 values of the elements This represents the relative ease with which the lone electron in the outer 's' orbital can be removed. The alkali metals are very reactive, readily losing 1 electron to form an ion with a 1+ charge : M -> M + + e - Due to this reactivity, the alkali metals are found in nature only as compounds. The alkali metals combine directly with most nonmetals:
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Group Trend1 - Group Trends: The Active Metals Group 1A:...

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