A. They are very hard.
B. They have low melting points.
C. They are not reactive.
D. They have a high density.
Answer: They have low melting points.
A. They are very hard.
B. They have low melting points.
C. They are not reactive.
D. They have a high density.
Answer: They have low melting points.
Additional Information: Alkali metals are known for having low melting points and being very reactive.
Subjects: Atomic Structure, Chemistry