Puzzle giveaway [Over - Solutions posted]

http://www.steamgifts.com/giveaway/Prior/counter-strike-global-offensive

Please don't give the URL or hints in this thread

Format: steamgifts.com/giveaway/Xxxxx

• nRT / V... Answer: P (For the ideal gas equation)
• One coordinate in sphericals... Answer: r (r, phi, theta) are spherical coordinates.
• Current... Answer: i, the standard notation for current in physics
• 8... Answer: o, the atomic number of oxygen. A few people were having trouble with this, but I didn't want to make it too easy
• k*N_av... Answer: r, the universal gas constant. k is the Boltzmann constand and N_av is Avogadro's number (or constant) = 6x10^23

Notes:
N_av is meant to be subscipt but don't think the formatting allows it.
I might be using different notation to what some are used to. Try changing some of the symbols if you're having trouble (and using Google).

Giveaway ends around 6pm GMT, $0.01 contribution needed.

Hints:
They are all directly related to science and maths.
For #4, it's above S. Oxygen is above Sulphur in the periodic table
For #5, av =/= average. It's something else related to chemistry.

Final hint:
The name of an enemy in Stargate: SG-1. It fits with the clues above. Prior

Alright one more hint:
A previous criminal offense on someone's record. Prior