25. Which of the electron configurations represents an element in the same Group as silicon? a) 1s2 2s22p6 352 3p6 452 3d 10 4p6 552 4010 5p2
b) 1s2 2s22p63s2 3p6 4s2 3d2
c) 152 252 2p6 352 3p6
d) 1s2 2s22p4

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2