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Find in the values reported in tables (you decide which table, one that is reliable and...

Find in the values reported in tables (you decide which table, one that is reliable and with scientific support, books, pages like the NIST, etc.) :

three chemical elements with negative Hall coefficient. How many valence electrons do these metals have? Why are charge carriers positive?

*Please include the reference of the table used

For comment:
you decide which table, one that is reliable and with scientific support, books, pages like the NIST, etc.

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