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

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]