Group_3_element
| 4 | Scandium (Sc) 21 Transition metal |
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| 5 | Yttrium (Y) 39 Transition metal |
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| 6 | Lutetium (Lu) 71 Lanthanide |
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| 7 | Lawrencium (Lr) 103 Actinide |
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| เลขหมู่ตาม IUPAC3 |
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