General chemistry

General chemistry

Contributors in General chemistry

General chemistry

The chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40. 078 amu. Calcium is a soft grey alkaline earth metal, and is the fifth-most-abundant element by mass in the ...

Potassium

Chemistry; General chemistry

The chemical element with the symbol K, and atomic number 19. Elemental potassium is a soft silvery-white alkali metal that oxidises rapidly in air and is very reactive with water, generating ...

Samarium

Chemistry; General chemistry

A chemical element with the symbol Sm, atomic number 62 and atomic weight 150. 36. It is a moderately hard silvery metal which readily oxidises in air.

Praseodymium

Chemistry; General chemistry

A chemical element that has the symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group.

Iodine

Chemistry; General chemistry

A chemical element with the symbol I and atomic number 53. Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers.

Caesium

Chemistry; General chemistry

The chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are ...