Révisi nurutkeun 19 Pébruari 2008 15.27 édit Kumincir (obrolan \| kontribusi) Birokrat, Kuncén 12.238 suntingan Tidak ada ringkasan suntingan ← Éditan saméméhna		Révisi nurutkeun 20 Pébruari 2008 11.00 édit bolaykeun Kumincir (obrolan \| kontribusi) Birokrat, Kuncén 12.238 suntingan →‎Réaksina dina amonia Éditan salajengna →
Baris ka-60: :2 [[Sodium_amide\|NaNH<sub>2</sub>]] + [[Nitrous_oxide\|N<sub>2</sub>O]] → [[Sodium_azide\|NaN<sub>3</sub>]] + [[Sodium_hydroxide\|NaOH]] + [[Ammonia\|NH<sub>3</sub>]] --> ==~~Trends~~ Kacondongan == Logam-logam alkali mibanda sababaraha pola mun dipapay ti luhur ka handap - misalna waé éléktronégativitas nurun, réaktivitas naék, sarta nurunna titik lééh jeung golak. Dénsitasna biasana ngaronjat, iwal kalium nu hampang batan natrium. The alkali metals show a number of trends when moving down the group - for instance, decreasing electronegativity, increasing reactivity, and decreasing melting and boiling point. Density generally increases, with the notable exception of potassium being less dense than sodium, and the possible exception of francium being less dense than caesium. <table border=0 cellpadding=2 cellspacing=0 width="100%"> <tr> <td bgcolor="#CCCCFF">'''~~Alkali~~Logam ~~metal~~alkali'''</td> <td bgcolor="#CCCCFF" align="center">'''~~Standard~~Beurat ~~Atomic~~Atom ~~Weight~~Baku ([[~~unified~~unit ~~atomic~~massa ~~mass unit~~atom\|u]])'''</td> <td bgcolor="#CCCCFF" align="center">'''~~Melting~~Titik ~~Point~~Lééh ([[kelvin\|K]])'''</td> <td bgcolor="#CCCCFF" align="center">'''~~Boiling~~Titik ~~Point~~Golak ([[kelvin\|K]])'''</td> <td bgcolor="#CCCCFF" align="center">'''~~Density~~Dénsitas ([[gram\|g]]·[[~~centimeter~~séntiméter\|cm]]<sup>−3</sup>)'''</td> <td bgcolor="#CCCCFF" align="center">'''~~Electronegativity~~Éléktronégativitas ([[~~Pauling~~skala ~~scale~~Pauling\|Pauling]])'''</td> </tr> Baris 84 ⟶ 83: </tr> <tr> <td bgcolor="#EEEEEE">~~Sodium~~Natrium</td> <td bgcolor="#EEEEEE" align="center">22.990</td> <td bgcolor="#EEEEEE" align="center">370.87</td> Baris 92 ⟶ 91: </tr> <tr> <td>~~Potassium~~Kalium</td> <td align="center">39.098</td> <td align="center">336.53</td> Baris 108 ⟶ 107: </tr> <tr> <td>~~Caesium~~Césium</td> <td align="center">132.905</td> <td align="center">301.59</td> Baris 116 ⟶ 115: </tr> <tr> <td bgcolor="#EEEEEE">~~Francium~~Fransium</td> <td bgcolor="#EEEEEE" align="center">(223)</td> <td bgcolor="#EEEEEE" align="center">? 295</td> Baris 124 ⟶ 123: </tr> </table> <!-- ==Biological occurrences== Baris 133 ⟶ 132: * Francium is an extremely rare element, and its chemical and physical properties have not been characterized to the same extent as the other alkali metals. It is known to have the same chemistry as cesium and is primarily an exotic curiosity in the world of physics. At any one moment in time, less than one ounce of francium is believed to exist on Earth, and its most stable [[isotope]] has a half life of a little less than 23 minutes.("Physics update" 9) This makes working with the element dangerous and difficult and radiochemistry techniques must be used to characterize its chemical properties. It has not been found to exist in any biological systems, and while there is no direct evidence of this, it is assumed to be true due to the rarity and instability of the element. --> == Rujukan == * [[:en:Alkali metal\|Alkali metal]], ti Wikipédia basa Inggris (19 Péb. 2008)

Logam alkali: Béda antarrépisi