sebutkan 20 macam unsur beserta lambangnya

Oksigen (O)
Carbon (C)
Kalium (K)
Natrium (Na)
Seng (Zn)
Hidrogen (H)
Kalsium (Ca)
Magnesium (Mg)
Yodium (I)
Litium (Li)
Nitrogen (N)
Flour (F)
Chlor (Cl)
Raksa (Hg)
Besi (Fe)
Fosfor (P)
Alumunium (Al)
Indium (In)
Nikel (Ni)
Perak (Ag)