A. all magnets have two poles
C. Ca and Br because they're metals and nonmetals
Answer:
D
Explanation: this was easy for me
I think the correct answer from the choices listed above is option A. The three components of air are all <span>classified as pure substances since they are not chemically bonded so they can be separated by certain processes and be present as a pure substance. Hope this answers the question.</span>
Answer:
the answer is d only as
ca reacts
mg reacts
k is more reactive so no reaction
mg is less reactive than sodium
