Potassium.

Group 1 Melting point 63.5°C, 146.3°F, 336.7 K
Period 4 Boiling point 759°C, 1398°F, 1032 K
Block s Density (g cm−3) 0.89
Atomic number 19 Relative atomic mass 39.098
State at 20°C Solid Key isotopes 39K
Electron configuration [Ar] 4s1 CAS number 7440-09-7

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