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1 actinium (89)
aluminum (13)
americium (95)
antimony (51)
argon (18)
arsenic (33)
astatine (85)
barium (56)
2 Decide whether a substance is chemically pure. If it is pure, the substance is either an element or a compound. If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture
3
Explanation:
The Law of Definite Proportions states that a compound will always contain the same ratio (of either atoms or mass) of the same elements.
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