Cool dry air meeting warm Moist air
The halogens and noble gases are alike because they are all non-metallic elements, with the exception of astatine, a radioactive
I think its c, it makes sense to me to be c
Answer:
25 grams
Explanation:
You strat off with 400 grams of your substance. By day 14, half has dcayed and you only have 200 grams left. By day 28, there are 100 grams of the substance. On day 42, there are 50 grams left. Finally, on day 56, the substance has been through four half-lives and 25 grams remain.
