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What is the node in the bonding antibonding orbital in molecular orbital theory? What do you think of the number of nodes?

The nodal plane is the place where the positive or negative sign of the wave function changes. The simplest nodal plane is the middle plane of the 2p orbit, where one side is positive and the other side is negative, and the wave function on the plane is 0. When atomic orbitals form molecular orbitals, the greater the degree of overlap, the stronger the bonding action and the lower the molecular orbital energy. The wave function of the nodal plane is 0, and its square, that is, the electron density is also 0.

Considering all the atoms that make up the molecule as a whole, it is considered that the electrons in the molecule move around the whole molecule in the multinuclear system, and the bonding electrons are delocalized or delocalized.

Recently, I have been learning the most troublesome organic chemistry. Some concepts are unclear: for example, what are bonding orbitals and what are antibonding orbitals, and how are the middle nodes of benzene molecules divided? Excuse me, everyone. Expand my answer to share Wechat scan Sina Weibo Qzone report browsing 1075 times can select one or more of the following keywords, search for relevant information. You can also directly click "search data" to search the whole question.

If the energies of the two atomic orbitals are not the same, the energy of the bonding orbitals with low energy is lower than that of the atomic orbitals with low energy, and the energy of the antibonding orbitals with high energy is higher than that of the atomic orbitals with high energy. From the formation of hydrogen molecular ions, it can be concluded that the molecular orbital theory focuses on the whole molecule and considers the molecule as a whole. The electrons in the molecule move in the comprehensive potential field of multiple nuclei and electrons.

Look on both sides. The nodal plane is the place where the positive and negative sign of the wave function changes, so if the left side is positive, the right side is negative, as long as the two-sided difference function is 0, the nodal plane value can be obtained.

The angular nodal plane refers to the number of nodal planes in the angular distribution map, the number is l; the radial nodal plane refers to the number of nodal planes in the radial distribution map, and the number is n-l-1. For example, the number of angular nodes of 2p orbits is Lindl, the number of radial sections of 3p orbits is n-l-1=2-1-1cm-0, and the number of angular nodes of 2p orbits is n-l-1=3-1-1x1.

Ask the orthopedic surgeon to take a look.

1. Disease analysis: Hello, according to the information you provided, your father has a subcephalic fracture of the femoral neck, which is not easy to heal. Now the X-ray shows that the fracture has been broken again, the internal fixation screw is loose and the fracture is also displaced. Guidance: this condition of your father must be operated again, the fracture will not heal without operation, and there will be osteonecrosis of the femoral head, which will affect the function of the affected limb.

2. Hello, according to your film diagnosis, there is no need for surgery now. Because the fibula fracture has basically healed. In addition, the fibula is an auxiliary bone, only used to stabilize the knee joint and ankle joint. If a person excises the fibula, the function is not serious, that is, he can still complete any action. According to your age, although the fibula is a little bent now, it will still be repaired after the fracture is healed, and it can be repaired almost in a few years.

3. The nails are smashed black, which is the blood stasis caused by the poor blood circulation caused by the injury of blood vessels. If it only hurts the fingertips, the meat here is very thick and can not hurt the bones under normal circumstances.

4. It's not very serious, but you'd better stay in hospital for observation for a few days. What you need to do is: patients first have to calm down their emotions, what to do is not to worry, maintain a good state of mind. Because bone is an important part of the human body, any orthopedic disease is not a trivial matter, so you should go to a professional orthopaedic hospital for treatment, which helps your condition and can not be easily ignored.

5. Hello, after reading your description, your present situation is that fracture healing is delayed, recovery is slower, and osteoblasts grow slowly.

How to make a leek box?

Use 90 degrees hot water and noodles. Knead it into a dough. Cover with a wet cloth and let hair dry for 20 minutes. Cut up the leeks. Add the right amount of oil to the leek and stir well. Put the shrimp skin into the water and soak it. Beat the eggs and stir-fry them in the pan. Mix leeks, eggs and shrimp skin. Stir well with salt, sesame oil and prickly ash oil. Sprinkle some flour on the board and cut the dough into the right size.

Ingredients: flour, hot water, salad oil. Excipients: eggs, leek, salt, chicken essence, shrimp skin. Knead the flour and hot water into a dough, cover with a wet cloth and wake up for 20 minutes. Beat the two eggs and stir-fry them in a frying pan to make chopped eggs. Wash and chop a handful of leeks, wash and drain with a spoonful of shrimp skin, put in scrambled eggs, add salt and chicken essence and mix well. Finally, add a spoonful of salad oil and mix well.

First of all, prepare the ingredients for cooking: 400 g leek, 3 eggs 260 g, shrimp skin 80 g flour 400 g. Pour the flour you need into the cooking basin to prepare the noodles. Today, you need to use a box of hot bread and leeks, so use boiling water and sprinkle a little bit of boiling water into the flour and stir it into snowflakes with chopsticks at the same time.

The practice of leek box is as follows: main ingredients: 300 grams of flour, 120 grams of boiled water, 65 grams of cold water excipients: one spoonful of oil, a pinch of salt, 2 eggs, 300 grams of leek flour, first add boiling water, mix into flocs with chopsticks. Then add cold water, mix well with chopsticks, knead into a smooth dough, cover with plastic wrap, wake up for 20 minutes and set aside. Chopped chives, sprinkle with appropriate amount of vegetable oil, mix well.

Leek box skin is golden and crisp, stuffing heart is fresh and tender, the taste is very beautiful, is a very popular traditional snack in northern China, so how to make leek box? Mix the noodles with warm water (softer), knead into a smooth dough, cover with plastic wrap and wake up for 10 minutes. Wash leeks and eggs. Wash the eggs, too. Cut up the leeks. Scramble the eggs into pieces and let them cool.