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1 alkali metals Eng.Admin 257
2 alkaline earth metals Eng.Admin 230
3 lanthanoid Eng.Admin 211
4 actinide series Eng.Admin 239
5 transition element Eng.Admin 182
6 Metalloid Eng.Admin 186
7 Nonmetal Eng.Admin 189
8 halogen elements Eng.Admin 202
9 noble gases Eng.Admin 237
10 Chemistry Eng.Admin 237
 
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