Match the following electron configrations with the appropriate first ionization energy: a}1s2 2p2 3p6 4s2 3d10 4p6 5s1 1356 kj/mol
b}1s2 2s2 2p6 3s2 3p6 4s2 595 kj/mol
c}1s2 2s2 sp6 3p6 4s2 3d10 4p6 409 kj/mol