00:01
The elements are lenium, 34 electrons.
00:08
For part a, the complete electron configuration, 34 electrons.
00:13
1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p4.
00:28
And let's draw the arrow diagram here.
00:30
So i'll draw this 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.
00:55
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30.
01:15
31, 32, 33, 34.
01:19
And in the orbital diagram, draw a box around each subshell...