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1. C
2. A
3. A & B
4. C
5. C
6. A
7. A
8. A & C
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Answer:
There are three isotopes of silicons. They have masses numbers of 28, 29 and 30. The average amount of silicons is 28.086alum
Explanation:
I learned this in class three days ago so I hope this is helpful i'm in high school ask me for help when ever you want Iĺl help you
It's 77C.......................