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Lanthanum with atom number 57 and mass number 139 has:
57 protons, 82 neutrons (since 57+82=139) and 57 electrons.
La-138 has 81 neutrons (i.s.o. 82) with 57 protons and 57 electrons.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoMost often 3. Some can also have oxidation states +2 and/or +4, and perhaps higher oxidation states.
Wiki User
∙ 12y agoLanthanum (57La) has electronconfiguration [Kr] 4d10, 5s2 5p6 5d9, 6s2 , so it has 2 valence electrons and maybe sometimes 3, being the first transition 5d-block metal-element.
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∙ 16y agoLanthanum has 57 electrons.
Wiki User
∙ 16y agoeight
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∙ 15y ago121
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∙ 13y ago57
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∙ 11y ago3
Wiki User
∙ 13y ago57
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Lanthanum has 2 valence electrons.
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