For example, the electron configuration of the neon atom is 1s2 2s2 2p6, meaning that the 1s, 2s, and 2p subshells are occupied by two, two, and six electrons, respectively. Electronic configurations describe each electron as moving independently in an orbital, in an average field created by the nuclei and all the other electrons.

Which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d3? What's the electronic configuration for an atom that has 33 electrons? What is the Aufbau principle?

The electron configuration is responsible for many physical and chemical properties of an element. Let us look at the electron configuration for helium, which is 1 s 2 1{\rm s}^2 1 s 2. The first integer, 1 1 1, indicates the primary energy level.

1、H氢1s1 2、He氦：1s2 3、Li锂：1s2 2s1 4、Be铍：1s2 2s2 5、B硼：1s2 2s2 2p1 6、C碳：1s2 2s2 2p2 7、N氮：1s2 2s2 2p3 8、O氧：1s2 2s2 2p4 9、F氟：1s2 2s2 2p5 10、Ne氖：1s2 2s2 2p6 11、Na钠：1s2 2s2 2…

In writing the electron configuration for Chromium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Chromium go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.

Free practice questions for AP Chemistry - Atomic Structure and Electron Configuration. Includes full solutions and score reporting.

For the Fe3+ ion we remove a total of three electrons (two from the 4s2 and one form the 3d6) leaving us with 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 1s2 2s2 2p6 3s2 3p6 3d5. The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom.

根据 能量最低原理 、泡利不相容原理和洪特规则，碳原子的价电子层中的四个价电子要先以自旋相反的状态填满2s轨道，才能开始以自旋相同的方式占据2p轨道。 以上。 有些人学了过渡金属的半充满电子结构之后常常会反过头来思考这个问题。 可是你要明白，过渡金属能跨不同轨道半充满的很大一部分原因是 能级交错 带来的轨道之间的低能量差。 在主族元素中，基本上 电子成对能 不会比相邻能级的能量差更大。 半充满是在轨道能量比较相近的时候，而且 电子成对能 比较大 …

Use square brackets [ ] around the chemical symbol of the noble gas. Continue to write remaining subshell after the noble gas core. An Example: Write electron configuration for potassium atom. Solution: The nearest noble gas element to the potassium is argon (Ar). The electron configuration for argon is: Ar: 1s2 2s2 2p6 3s2 3p6

我们以K（钾）原子为例，其atomic number为19，原子核外有19个电子， 电子排布 结构为1s2 2s2 2p6 3s2 3p6 4s1，其在3p上排列6个电子后，最后一个电子排布在4s上，而非3d上。