"Most halogen oxides are unstable and can explode and decompose when exposed to impact or even light. ”

"Important halogen oxides are ClO2, I2O5, OF2, from the molecular formula is easy to find, fluorine is a very special halogen, fluorine in OF2 oxidation state is negative, -1 valence. In other words, the compound of fluorine and oxygen is a fluoride of oxygen, not an oxide of fluorine. In other words, fluorine is more oxidizing than oxygen. ”

Liu Hualong's lecture on halogens in this class is in line with Lanjie's meaning.

Cl2+2NaOH=NaClO+NaCl+H2O

"Chlorine is dissolved in sodium hydroxide solution to produce sodium hypochlorite, sodium chloride and water. Do you know sodium hypochlorite?84 have you used it?84's main ingredient is sodium hypochlorite. In sodium hypochlorite, chlorine is +1 valence, and in sodium chloride, chlorine is -1 valence. ”

2F2+2NaOH=2NaF+H2O+OF2

"Fluorine can also be dissolved in sodium hydroxide solution, and among the two fluorides on the right side of the equal sign, fluorine is -1 valent. ”

"Please remember that there is no single line of disaster, fluorine is incomparable, and where fluoride other than fluoride is encountered, fluorine has only one valence, -1 valence. Based on this principle, the students put this formula together. ”

（）K2MnF6+（）SbF5→（）KSbF6+（）MnF3+（）F2↑

The fluorine in fluorine is 0-valent, the fluoride in fluoride is -1 valence, and the potassium in the compound is +1 valence, these are all known conditions that he did not tell me, but I knew by heart.

So in this chemical reaction, the valency of antimony does not change, it is +5 valence from left to right.

What changed was manganese, and manganese changed from +4 to +3.

Then there's the numbers game, just write out the trim factor in parentheses and you're done.

This is a scoring question, and under the guidance of Mr. Liu, all the students got the score for this question.

Liu Hualong nodded and said, "Good, that's all for fluorine, let's talk about chlorine next." ”

"That's it?" Ranger was extremely disappointed.

Liu Hualong asked rhetorically, "Lan Jie, are you not satisfied?"

"Teacher Liu, I'm very puzzled, chlorine, bromine, and iodine have both positive and negative values and 0 prices, why is fluorine always -1 and 0 valent?

Ranger had been thinking about this for a whole day, to no avail. Therefore, he consulted Mr. Liu and hoped that Mr. Liu would solve his doubts.

“Good。 Liu Hualong smiled mysteriously, he said: "This question is good, but I don't answer it in class, Lan Jie, if you are interested, you can find me after class." We continue to talk about chlorine, chlorine dioxide is a common bleaching agent, sanitizing agent, is a strong oxidizing agent and chlorinating agent, the central chlorine atom takes sp2 hybridization, the molecular configuration is V-type. In the chlorine dioxide molecule, the Cl-O bond length is 149pm, please remember this number, it is a little longer than a double bond and a little shorter than a single bond......"

Remember, remember.

Again.

There are a lot of knowledge points in chemistry that need to be memorized.

After the five thinking values were improved, Lan Jie's memory was also strengthened to a certain extent.

It is not difficult for Ranger to remember the conclusion, but he wants to understand the essential reason for this conclusion, so as to draw inferences from others.

When the bell rang for the end of class, Lan Jie rushed to the podium, he kept Teacher Liu and asked Teacher Liu to answer his doubts.

Liu Hualong hit the nail on the head and gave the answer: "Fluorine has no D orbital." ”

Airplanes!

Rangier's brain exploded.

Ahhh

I'm stupid, I'm really stupid.

Fluorine doesn't have a d orbital, such a simple logic, why didn't I think of it?

Liu Hualong was very satisfied with Lan Jie's idiotic expression, and he wrote a detailed analysis process on the blackboard, saying as he wrote: "Other halogens can disassemble the p orbital electrons in pairs, so as to enter the d orbital to form a covalent compound with a positive oxidation state, but fluorine can't, so the valency of fluorine can only be 0 or -1." ”

Airplanes!

Buzz!

Ha!

Hahaha!

Ollie give V to ah!

Lan Jie understood, Lan Jie understood, Lan Jie he got through it all at once!

Yesterday I dismantled a yarn and dismantled it! No matter how much I dismantled the p orbital electrons, it was in vain, because this little bastard of fluorine did not have a d orbital!

Do you know non-fluorine?

Fluoro-Shou Qitian!

Lan Jie went from stupidity to stupidity, from madness to madness, from madness to joy, from joy to enlightenment, from ......

"Lan Jie, I'm glad that you, a young man who is good at thinking, can think to this extent, I'm happy, and I hope that there are more students like you. ”

Liu Hualong was extremely satisfied with Lan Jie's colorful facial expressions, and he added: "Another reason is that the electronegativity of fluorine is 3.98, and it is too difficult to snatch electrons from it, so under normal circumstances, it is impossible to make fluorine become positive valence." Of course, technology is advancing, chemistry is developing, and under certain extreme conditions, such as focusing a point with a high-power laser, a temperature range infinitely close to 0 Kelvin can be obtained, and fluorine can be forced to take positive valence. This is a high-level question, we will not go into in-depth discussion, Lanjie, you can study it yourself after you go to university. ”

Extreme conditions?

Absolute Zero?

Laser correction?

Forcing good people to become prostitutes?

Oh no, forcing fluoride to be positive?

This little widow of chemistry is a bit coquettish!

Oh no, chemistry is a little bit of a gadget.

"Understood, understood, thank you Teacher Liu for your advice! One bow, two bows! Teacher Liu walks slowly!" Lan Jie bowed twice, one bow to respect Teacher Liu, and the second bow to respect knowledge.

The student is diligent and inquisitive, courteous and thoughtful, and has a very high understanding, and is actually a good student.

When Teacher Liu left, he had a serene smile on his face.

When Mr. Liu explained that "fluorine has no D track" to expand knowledge, the onlookers were not Lan Jie alone.

Zhang Yutong, Li Zihan, Wu Zihan and other more than 20 students were watching.

Some people understand it thoroughly, some people don't understand it at all, and some people don't understand it at all.

"Lanjie, I'm so depressed. ”

During the lunch break, Zhang Yutong confided in Lan Jie about her troubles and studied Lan Jie's chemistry workbook.

"Huh?"

"I couldn't keep up with Mr. Liu's teaching rhythm more and more, I was helpless, very distressed, and I wanted to scold and lie down. ”

"Hah...... Yawn ......"

"Lan ...... Asleep?"

Zhang Yutong has never seen Lan Jie take a nap, and during the usual lunch break, Lan Jie has a stable output, and he will study the heavenly books in the classroom that she can't understand.

At this time, Lan Jie was lying on the desk and falling asleep, and he muttered indistinctly: "Little widow...... Kill you...... I can't control it...... I'll count ......"

"Walter?"

Zhang Yutong was stunned, Lan Jie, this guy has been a little abnormal in the past two days!

Isn't it fragrant for so many young single unmarried girls in sheep?

Little widow?

Do...... Get her?

"Brother, you must control yourself and never embark on the path of sin. ”

Zhang Yutong whispered softly in Lan Jie's ear with a heavy heart, and then took a pencil and approved a sentence on Lan Jie's chemistry workbook: There is no such thing as a great talent without great will power.

Ranger seems to have encountered something strange in his dream, getting into an unscrupulous car.

Zhang Yutong finished studying Lan Jie's chemistry homework book, and then quietly left.

Ranger doesn't have the habit of taking a nap.

He slept for the first time in two hours at noon today.

If it weren't for Tang Xiaoyun punching Lan Jie awake, he might have slept in Chinese class.