Test Mode
Reading Mode
Right = 0
Wrong = 0
Ca(20) – 1s²2s²2p3s²3p4s²
P(15) - 1s²2s²2p3s²3p¹4s²
Fe(26) - 1s²2s²2p3s²3p3d4s²
Cu(29) - 1[Ar] 3d4s¹