Labels:text | screenshot | diagram | colorfulness | display | font | number | line OCR: $ 3 THE 2 Li Be Key PERIODIC TABLE Lithium 6.941 Berylium 9.012 OF ELEMENTS 3 Group number GROUPS I - II Na Mg Block Sodium Magnesium 22.990 24.305 -$3 Atomic number 20 2 Li Symbol K Ca Lithium Name Potassium 6.941 39.098 Calcium 40.078 Standard atomic weight (or relative 5 37 38 Principal atomic mass of Rb Sr quantum longest-living isotope) Rubidium Strontium number(n) 85.468 87.62 (I-VIII refer to 55 56 old group numbers) Cs Ba Caesium 132.905 Barium 137.327 = gas 87 8 8 = liquid Fr Ra = radioactive Francium (223.02] Radium [226.03]
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