In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: How many protons and electrons each do carbon atoms have? Answer: six

A: Carbon atoms have six protons and electrons each.
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Q: Question: What type of animal in the sea spend most of their lives as medusae? Answer: jellyfish

A: Jellyfish type of animal in the sea spend most of their lives as medusae.
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Q: Question: What is the force of attraction between a positive metal ion and valence electrons? Answer: metallic bond

A:
A metallic bond is the force of attraction between a positive metal ion and valence electrons.
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