Chemical Physics Letters was created in 1967.
Physics Letters was created in 1962.
Laser Physics Letters was created in 2004.
Applied Physics Letters was created in 1962.
Letters in Mathematical Physics was created in 1975.
Modern Physics Letters A was created in 1986.
Research Letters in Physics was created in 2007.
Modern Physics Letters B was created in 1987.
Physical Chemistry Chemical Physics was created in 1999.
The current impact factor of Physics Letters A is 2.349.
On the Applied Physics Letters website one can find a wealth of information regarding physics. It is an electronic version of a newsletter about science and physics.
There is not a chemical formula for energy as it is not a chemical. However in some contexts such as physics it can be represented as many different letters (depending on the form it is in eg. Kinetic [ke] or gravitational potential [gpe]). Hope this helps :)
The current impact factor of Physics Review Letters is 8.839.