Consider an oxygen-concentration cell consisting of two zinc electrodes. One is immersed in a water solution with low oxygen concentration and the other in a water solution with a high oxygen concentration. The zinc electrodes are connected by an external copper wire. (a) Which electrode will corrode

distance, luminosity, brightness, radius, chemical composition, and temperature

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer