Câu trả lời tốt nhất
z = 19: 1s2 2s2 2p6 3s2 3p6 4s1
z = 27: 1s2 2s2 2p6 3s2 3p6 3d7 4s2
z = 8: 1s2 2s2 2p4
z = 24: 1s2 2s2 2p6 3s2 3p6 3d5 4s1
z = 29: 1s2 2s2 2p6 3s2 3p6 3d10 4s1
×
z = 19: 1s2 2s2 2p6 3s2 3p6 4s1
z = 27: 1s2 2s2 2p6 3s2 3p6 3d7 4s2
z = 8: 1s2 2s2 2p4
z = 24: 1s2 2s2 2p6 3s2 3p6 3d5 4s1
z = 29: 1s2 2s2 2p6 3s2 3p6 3d10 4s1