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margott164
@margott164
December 2020
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Exercice 1
Les dentifrices au "luor" aident à lutter contre la formation des caries.
On le trouve, entre autres dans de nombreux dentifrices.
Al L'atome de fluor (F) a pour numéro atomique Z = 9 et son nombre de nucléons est : A =19
1. Que peut-on déduire sur la composition du noyau de fluor?
2. Combien y aura-t-il d'électrons autour de ce noyau ? Pourquoi ?
3. Représenter cet atome de fluor (sans oublier la légende).
Pourriez-vous maider svp.
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Bjr pourriez-vous maider svp Merci
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IV- vocabulary: can you guess the secret ingredient? Aider moi svp 1.I can be white or brown. I can be in powder form or in cubes. I am very sweet: 2. I am made of milk. I am salty. I can be yellow, white, orange, blue. 3. I am a red fruit, but people eat me like a vegetable! I am in salad or in sauces. 4. I am also red. Vegetarians can't eat me! 5. People can drink me in the morning. I have a lot of vitamins.
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