Transcription of THE s-BLOCK ELEMENTS - NCERT
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THE s-BLOCK ELEMENTS - NCERT
299 THE s- block ELEMENTSThe s- block ELEMENTS of the Periodic Table are those inwhich the last electron enters the outermost s-orbital. Asthe s-orbital can accommodate only two electrons, twogroups (1 & 2) belong to the s- block of the Periodic 1 of the Periodic Table consists of the ELEMENTS :lithium, sodium, potassium, rubidium, caesium andfrancium. They are collectively known as the alkali are so called because they form hydroxides onreaction with water which are strongly alkaline in ELEMENTS of Group 2 include beryllium, magnesium,calcium, strontium, barium and radium. These elementswith the exception of beryllium are commonly known asthe alkaline earth metals. These are so called because theiroxides and hydroxides are alkaline in nature and thesemetal oxides are found in the earth s crust*.
300 CHEMISTRY Lithium and beryllium, the first elements ... Atomic number 3 11 19 37 55 87 Atomic mass (g mol–1) 6.94 22.99 39.10 85.47 132.91 (223) ... Solutions in liquid ammonia: The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting
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