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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Metallic bonds are forces of attraction between positive metal ions and the valence electrons that are constantly moving around them (see the Figure below ). The valence electrons include their own and those of other, nearby ions of the same metal. The valence electrons of metals move freely in this way because metals have relatively low electronegativity, or attraction to electrons. The positive metal ions form a lattice-like structure held together by all the metallic bonds. For an animated version of metallic bonding, go to this URL:. Answer: metallic bonds
Output:
What kind of bonds are forces of attraction between positive metal ions and the valence electrons that are constantly moving around them?