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Sagot :

LEAFE

Bonjour,

q = 1,15 x 10⁻¹⁷ C

e = 1,6 x 10⁻¹⁹ C

Z = q / e = (1,15 x 10⁻¹⁷) / (1,6 x 10⁻¹⁹ ) = 72

L'atome de hafnium possède 72 protons.

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