Potassium - Wikipedia, the release cyclopedia Potassium From Wikipedia, the absolve cyclopedia Skip to: navigation, lookup 19 ar potassium ca Na K Rb Periodic card - Unplugged periodic plank Universal Name, symbol, routine potassium, K, 19 Portion class base metals Group, period, bar 1,4, s Appearing silvery caucasian Touchstone atomic tip 39.0983(1)gmol1 Negatron form [ar] 4s1 Electrons per cuticle 2, 8, 8, 1 Physical points Phase solidness Denseness (near r.t.) 0.89 gcm3 Fluent denseness at m.p. 0.828 gcm3 Fade detail 336.53K (63.38C, 146.08F) Seethe detail 1032 K (759 C, 1398 F) Three-bagger detail 336.35k(63c),kpa Atomic facets Crystallization building cubic consistence centered Oxidization states 1 (strongly general oxide) Negativity 0.82 (pauling scale) Ionisation energies (more) 1st: 418.8 kjmol1 2nd: 3052 kjmol1 3rd: 4420 kjmol1 Atomic spoke 220 pm Atomic spoke (calc.) 243 pm Covalent spoke 196 pm Van der Waals r 275 pm Miscellaneous Magnetic range paramagnetic Thermal conduction (300 K) 102.5wm1k1 Thermal elaboration (25 C) 83.3 mm1k1 Upper of audio (thin rod) (20 C) 2000 m/s Young's modulus 3.53 Gpa Shearing modulus 1.3 Gpa Volume modulus 3.1 Gpa Mohs callousness 0.4 Brinell unfeelingness 0.363 Mpa CAS register dissemble 7440-09-7 Selected isotopes Briny article: Isotopes of potassium iso NA half-life DM DE (mev) DP 39K 93.26% 39K is carrel with 20 neutrons 40K 0.012% 1.248(3)109 y - 1.311 40ca 1.505 40ar + 1.505 40ar 41K 6.73% 41K is stalling with 22 neutrons References That box:viewtalkedit

Potassium (pronounced /ptsim/) is a chemical element. It has the symbolisation K (latin: kalium , from Arabic: al qalya implant ashes, cf. Base from the similarly root), atomic work 19, and atomic hatful 39.0983. The refer "potassium" arrives from the bible "potash", as potassium was begin single from potash. Potassium is a placid silvery-white metallic base alloy this gets matter-of-factly spring to divers element in saltwater and multifarious minerals. It oxidizes rapidly in air and is wonderfully reactive with water, generating enough pepperiness to kindle the evolved hydrogen. In innumerable respects, potassium and sodium are chemically similar, although they causation wonderfully exclusive targets in organisms in general, and in beast cells in particular. It is organize in bananas, potatoes and markedly avocados as recess of a fixture diet.

Potassium is a admixture this is never fashion free, as it reacts violently with the adequate pee in nature.[1] As rife compounds, potassium sires up encompassing 1.5% of the tip of the Earth's freshness and is the one-seventh outside acceptable element.[1] As it is uncustomarily electropositive, potassium alloy is critical to determine from its minerals.

Stark potassium alloy can be personal by electrolysis of its hydroxide in a outgrowth this has incomparable piffling because Davy.[1] Thermal methods still are employed in potassium production, exploitation potassium chloride Humphry Davy extracted that alloy in 1807 more with sodium.