Between which type of elements do ionic bonds occur, and how do electrons act within the bond?

A: metals and metals, electrons freely moving
B: metals and nonmetals, electrons transferred
C: nonmetals and nonmetals, electrons shared
D: nonmetals and metals, electrons shared

1: The bonds can shift because valence electrons are held loosely and move freely.

2: metals and nonmetals, electrons transferred.
3: ionic
4: four covalent bonds
5: three

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A,b c,d.