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QCM 14 session 1 chimie du solide


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Salut au QCM 14 je comprends pas pourquoi on compte vrai "Dans une maille c.c., l’atome situé au centre du cube élémentaire est entouré de 8 autres atomes à une distance égale à a racine de 3/ 2 " au lieu de a racine de 3 / 4 

Est-ce que vous pourriez m'expliquer svp ? 

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