Tagged notes on this photo help in identification.

Description
The Mojave has well-defined light-edged diamonds down the middle of their backs fading to bands toward the tail. They can be colored greenish gray, olive-green, or occasionlly brownish or yellowish. Source: Arizona Herpetological Society.com.

Comments
C. scut venom is one of the most lethal on earth, many times more powerful than a common cobra. Rattlesnake venom typically contains a hemotoxin. While some Mojave rattlesnakes (Venom B populations) exhibit hemotoxic venom, there are others (Venom A populations) that possess what is referred to as "Mojave Toxin", a potent neurotoxin, and still others that demonstrate both hemotoxic and neurotoxic venom. Due to the danger posed by the Mojave Toxin, the bite of a Mojave Rattlesnake is considered one of the most dangerous in the United States.

Source: Wikipedia