What tendency is the standard reduction potential of an element based on?

a. the tendency of an atom to attract electrons
b. the tendency of an element to gain electrons
c. the tendency of an element to lose electrons
d. the tendency of an element to share electrons

the tendency of an element to gain electrons

Explanation:

Electrode potential is considered to be the tendency of a metal to lose or gain electrons when dipped in its own ionic solution.

For example Zn dipped in ZnSO₄.

Now if a metal or element is losing electrons then it is considered as oxidation potential and it an element is gaining electrons then it is considered as reduction potential.

Standard word is related with standard condition of temperature, pressure and concentration.

standard temperature is 298 K

standard pressure is 1 bar

standard concentration is 1M.

the answer is na (sodium)