Try putting this in biology category not chemistry so more ppl can help :)
I think it's Chlorine but, not 100% sure. so C.
Answer:
n = 4 there are 16 orbitals
n = 1.5atm (15L) / .0821 (280k) = .98 mol NaCl
NaCl = 22.99g Na + 35.45g Cl = 58.44g NaCl
58.44g NaCl x .98 mol NaCl = 57.27g NaCl
Explanation:
hope you get it right :)