Which of the following refers to the ground-state electron configuration of an atom? Q options: 1s12s1 [Kr]5p1 [Ne]3s13p2 [Ar]4s23d6. Which central atom has sp2 hybridization? Q options: H2O PH3 SO2 NH3 Save Q Which set of quantum numbers (n, l, ml, ms) represents the outermost electron in the gaseous aluminum atom? Q: 2,1,0,+1/2 2,1,-1,+1/2 3,1,-1,+1/2 3,0,0,+1/2. What type of orbital is used to form the pi-bond in C2H4: H2C=CH2 Question 12 options: sp3 sp2 sp p