According to the electron sea theory, what happens when a collection of metal atoms are in close proximity to each other? All electrons become free and separate from nuclei.
Some electrons float amongst the atoms.
Some protons float amongst the atoms.
All protons become free and separate from nuclei.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

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