Which atom tends to gain 1 electron when it combines with another atom?

What is a metal replacement reaction

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

In a copper wire, a temperature increase is the result of which of the following