โ๏ธ๐งฒโก๏ธ
๐งช๐ชD
๐ฉ๐ฅ๐ฅ
๐งช๐จโจ
๐งฑ๐๐ช
โ๏ธโ๏ธ๐
๐งชโ๏ธ๐ข4๏ธโฃ
#transition metals #metal properties #conductivity #iron triad #engineering materials #physical properties