Chemical Physics Letters was created in 1967.
Physics Letters was created in 1962.
Research Letters in Physics was created in 2007.
Modern Physics Letters A was created in 1986.
Applied Physics Letters was created in 1962.
Laser Physics Letters was created in 2004.
Letters in Mathematical Physics was created in 1975.
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.