cesium
Soft alkali metal
Cesium is a soft, silvery-gold metallic element, atomic number 55.
It is among the most reactive of all metals—it ignites spontaneously in air and reacts explosively with water.
Cesium's most familiar application is in atomic clocks, where the vibration of cesium atoms provides the standard definition of a second.
Also spelled caesium, especially in British English.
Lightest solid element
- sodiumEleventh element, highly reactive
- potassiumNineteenth element, symbol K
- rubidiumAlkali metal, atomic thirty-seven
- franciumRarest occurring natural element
periodic table · electropositive · soft metal · flame test · spectroscopy · Bunsen · Kirchhoff · discovery
Prone to sudden detonation
- exothermicReleasing energy as heat
- oxidationLosing electrons chemically
- hydroxideAlkaline oxygen-hydrogen compound
- combustionExothermic reaction with oxygen
flammable · corrosive · ignition · spontaneous combustion · hyperreactive
Quantum-vibration timekeeping device
- timekeepingMeasuring duration's passage
- GPSSatellite-based location technology
- magnetometerInstrument measuring field strength
- petroleum industryCrude extraction and refining businesses
infrared detectors · vacuum tubes · catalyst · radiation therapy
lithium
Lightest solid element
- sodiumEleventh element, highly reactive
- potassiumNineteenth element, symbol K
- rubidiumAlkali metal, atomic thirty-seven
francium · periodic table · electropositive · soft metal · flame test · spectroscopy · Bunsen · Kirchhoff · discovery · metallic
explosive
Prone to sudden detonation
- exothermicReleasing energy as heat
- oxidationLosing electrons chemically
- hydroxideAlkaline oxygen-hydrogen compound
combustion · flammable · corrosive · ignition · spontaneous combustion · hyperreactive
atomic clock
Quantum-vibration timekeeping device
- timekeepingMeasuring duration's passage
- GPSSatellite-based location technology
- magnetometerInstrument measuring field strength
petroleum industry · infrared detectors · vacuum tubes · catalyst · radiation therapy
- radiobiologyradiobiology, DNA damage, mutations, ionizing radiation, cell damage
- periodic tableperiodic table, elements, hydrogen, helium, carbon
- elementsoxygen, hydrogen, carbon, helium, nitrogen
- metalsaluminum, steel, copper, iron, gold
- soft ccell, celery, cent, center, central
- Alkali Metalslithium, sodium, potassium, rubidium, francium