Kalkojenler periyodik tablonun 16. grubunda yer alan elementlerdir
Grubun temel elementleri oksijen, kükürt, selenyum, tellür, polonyum ve karaciğermorium'dur
Tipik oksidasyon durumları -2 ve -1'dir
Oksijen
Yerkabuğunda ve insan vücudunda en bol bulunan elementtir
İki allotropik formu vardır: O2 ve O3
Elektronegatiflikte flordan sonra ikinci sıradadır
Kükürt
Üç farklı allotropik formu vardır: eşkenar dörtgen, monoklinik ve plastik kükürt
Oksijenden farklı olarak d-alt seviyesine sahiptir
Selenyum ve Tellür
Selenyum yarı iletken, tellür ise metaloid özelliklere sahiptir
Selenyum doğada nadir bulunur, tellür ise kükürt içinde yer alır
Polonyum ve Livermorium
Polonyum radyoaktif bir yarı metaldir
Livermorium yapay olarak sentezlenmiş, kararlı izotopu olmayan bir elementtir
Yanıtı değerlendir
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