The value of standard reduction electrode potential is more than zero for how many elements of 3d series?

The standard reduction potential is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. Each element in the 3d series (Scandium to Zinc) has a specific standard reduction potential.

To answer your question, we need to look at the standard reduction potentials of each of these elements.

1. Scandium (Sc): -2.02 V
2. Titanium (Ti): -1.63 V
3. Vanadium (V): -1.18 V
4. Chromium (Cr): -0.74 V
5. Manganese (Mn): -1.18 V
6. Iron (Fe): -0.44 V
7. Cobalt (Co): -0.28 V
8. Nickel (Ni): -0.25 V
9. Copper (Cu): +0.34 V
10. Zinc (Zn): -0.76 V

From the above data, we can see that only Copper (Cu) has a standard reduction potential greater than zero. So, only one element in the 3d series has a standard reduction potential greater than zero.