- 1s, 2s, 2p, 3s, 3p, 3d.
- 1s, 2s, 2p, 3s, 3p, 4s.
- 1s, 2s, 2p, 3d, 4s, 3p.
- 1s, 2s, 2p, 3s, 4s, 3p.

Category: Chemistry
- To achieve a more stable configuration (half-filled or fully-filled subshells).
- To increase electron repulsion.
- To reduce nuclear charge.
- To gain more spin.
- It is spherical.
- It is dumbbell-shaped.
- It has no nodes.
- It can hold 10 electrons.
- n and l.
- ml?.
- ms?.
- Only n.
- Why electrons are attracted to the nucleus.
- Why inner electrons shield outer electrons.
- Why outer electrons are more easily removed.
- All of the above.
- 2s is always larger.
- 2p is always larger.
- Their sizes are comparable but 2s penetrates more.
- 2s is smaller due to less energy.
- The electron's orbital motion.
- The electron's intrinsic angular momentum.
- The interaction with the nucleus.
- The electron's charge.
- [Ar]4s23d104p2.
- [Ar]3d104s24p2.
- [Kr]4s23d104p2.
- [Ar]4s24p23d10.
- [Ar]4s23d4.
- [Ar]3d64s2.
- [Ar]4s23d6.
- [Ar]4s13d7.
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