2007-01-02 06:39:41 · 4 answers · asked by sexi 1 in Science & Mathematics ➔ Chemistry
element 21 is scandium "Sc"
confg- 1s2 2s2 2p6 3s2 3p6 4s2 3d1
2007-01-02 07:22:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Using the periodic table to do this for you.....column 1 and 2 are s orbitals (hold 2 electrons), columns 3-8A are p orbitals (hold 6 electrons) and transition metals are d orbitals (10 electrons)
Read across rows until you get to element 21!
1s2 2s2 2p6 3s2 3p6 4s2 3d1
2007-01-02 14:48:23 · answer #2 · answered by teachbio 5 · 0⤊ 0⤋
Scandium: 1s2 2s2 2p6 3s2 3p6 3d1 4s2
But remember that 3d level is higher in energy than 4s level, thats why 4s level will be filled first
2007-01-02 14:59:18 · answer #3 · answered by LC 3 · 0⤊ 0⤋
http://chemistry.about.com/od/generalchemistry/index_a.htm
2007-01-02 14:52:49 · answer #4 · answered by sparbles 5 · 0⤊ 0⤋