What's the next number: 3 11 19 37 55 xx ?

Bannockburn

87 -- Francium Metal Li Na K Rb Cs Fr Configuration of outer electron layer of atom 2S1 3S1 4S1 5S1 6S1 7S1 Atomic number 3 11 19 37 55 87 Relative Atomic mass 6.939 2.9898 39.098 85.47 132.905 * Atomic radius (nanometre) 0.155 0.189 0.236 0.248 0.268 0.280 Density (g/cm3) 0.534 0.97 0.86 1.53 1.88 2.4 Melting point (0c) 174.54 97.8 63.7 38.89 28.4 27.1 Boiling point (0c) 1347 882-889 774 688 678 677 Bannockburn Mar 18 02, 2:04 AM

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