Which response includes all the following that are properties of most metals, and no other properties?
z1) they tend to form cations.
z2) they have high first ionization energies.
z3) they have outer electronic shells that are more than half-filled.
z4) they tend to form ionic compounds when they combine with the elements group viia.

1. z3 and z4 only
2. z2, z3, and z4 only
3. z1, z2, and z3 only
4. z1 and z4 only
5. z1 and z3 only