Potassium is a chemical element with symbol "K"  (from Neo-Latin  kalium ) and atomic number 19. Elemental potassium is a soft sil... [Read More]

Argon is a chemical element with symbol "Ar"  and atomic number 18. It is in group 18 (noble gases) of the periodic table. Argon i... [Read More]

Chlorine   is a   chemical element   with symbol  "Cl"   and   atomic number  17. Chlorine is in the  halogen group (17)   and is ... [Read More]

Sulphur is a   chemical element   with symbol "S"   and   atomic number 16. It is an   abundant,   multivalent   non-metal. Under ... [Read More]

Phosphorus   is a   non-metallic   chemical element   with symbol "P"   and   atomic number  15. A   multivalent   pnictogen , pho... [Read More]

Silicon, a   tetravalent   metalloid , is a   chemical element   with the symbol   Si   and   atomic number   14. It is less reactive than i... [Read More]