HELPPP PLS ILL GIVE 100 POINTS PLUS

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

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How many neutrons does an element have if its atomic number is 50 and its mass number is 166