I have a full-time hero system

But he couldn't care less. .

The principle he said has been proved by countless experiments and is absolutely correct.

"Many students must have questions, and I welcome such questions very much," Yuan Xiao continued, "Then, let's put the question on hold for now.

Let's think about it, if this is the case, what benefits will it have for our research direction. "

Fang Xuyao ​​deserves to be the person with the highest IQ in the country: "In this way, we can write the corresponding proton number for each element, and by this value, we can easily distinguish the element."

Su Chenyi was not to be outdone: "In the future, we can also discover other elements with different numbers of protons based on deduction."

"Then, is there something with the same number of protons but not the same element?" Xia Wanqing's fantastic idea.

Very good, everyone's thinking is very active.

Yuan Xiao expressed his patience.

This is the divergent thinking that high school students should have.

Instead of rigidly accepting various frame-by-frame theories.

"Everyone's opinions are correct, yes," Yuan Xiao nodded, "There are more complicated situations.

So, let's do a simple mind map for the time being.

Each element has a different number of protons.

Have you noticed that in my equation, an atomic number is written.

What does this mean? It means that we can arrange all the elements according to the size of the value.

And classify them, so as to realize the systematization and convenience of research.

This is the core content we need to discuss in the next course.

Periodic Table of Elements! "

The periodic table of elements in this world is officially published at this time.

"The atomic number of hydrogen is 1, while that of oxygen is 8," Yuan Xiao wrote, "Are you curious, what else can we put between 1 and 8?"

A trace of excitement flashed across everyone's faces.

This is unprecedented knowledge.

And it's so eloquent and vivid.

Hurry up, teacher.

Yuan Xiao smiled and said, "Helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon!

These are the 10 elements we need to know today. "

On the blackboard, an arrangement of these elements subsequently appeared.

The students are frantically taking notes.

Just kidding, this may be an epoch-making discovery.

After all, it was brought back by Yuanxiao Archeology, so it is definitely worth a lot.

Although the copyright is gone.

but!

Once this is released on the Internet, maybe I will become the traffic king and queen.

Properly set fire to it.

Hurry up and record!

"So," Yuan Xiao looked at the students, "the atomic number is there, now there is one more question.

We all know that water is produced by the combined action of hydrogen and oxygen.

However, do you know why there is an effect between them? "

Everyone shook their heads.

teacher!Don't be fooled, just speak up.

"This is the study of chemistry, the second most important thing." Yuan Xiao raised his finger to show his attention.

chemical bond!

A new concept appeared on the blackboard.

Yuan Xiao smiled: "So, what is a chemical bond? In fact, it is divided into several types. We will gradually explore this point in future studies.

The crux of the problem is that we need to understand what the nature of the chemical bond is. "

Speak up!Terrified!

?Pride index +1111, +1112, +1113...

That's great, Wah Rui Goode!

"Let's take the hydrogen atom and the oxygen atom as an illustration," Yuan Xiao tapped his finger on the blackboard, "It should be noted here that we need to understand one more thing, that is, the number of electrons in the outermost shell of each type of atom.

The number of electrons in a hydrogen atom is 1, so the number of electrons in the outermost shell is also 1.

The oxygen atom has 8 electrons, but only 6 in its outermost shell.

What's wrong with this. "

Yuan Xiao paused for a moment, Slow Rissiao opened the thermos and took a sip of water: "There is a problem, that is instability.

For example, in nature, we cannot find a single oxygen atom.

The reason why it is unstable, everyone remembers a rule, the stable state of the outermost electron number is 2 and 8.

That is to say, for a hydrogen atom, it needs an extra electron to stabilize itself.

Similarly, an oxygen atom needs two electrons.

This is the key to the interaction between them.

So in reality, an oxygen atom will usually combine with two hydrogen atoms and share some of the electrons.

This type of chemical bond is also called a covalent bond.

Of course, it is enough for everyone to have an idea today.

In this way, the most important thing in the world, an indispensable existence for life, water was born. "

Everyone suddenly realized.

"Then, at this point, we can clearly know what the so-called chemical bond is." Yuan Xiao gestured, "It can be simply imagined as the arm of the atom.

Hydrogen atoms have only one arm, while oxygen atoms have two arms.

Similarly, a carbon atom has four arms.

The size of the arm determines its relationship with other elements.

The principle of the so-called chemical bond is very similar to the hand-in-hand game.

If you explain it like this, everyone can understand it. "

The students understood.

Yuan Xiao began to enter the end of this class: "So, to study chemistry, we need to know the history of the development of chemistry, and then decide the direction of our research.

The two most important cores are the number of protons that determine the existence of an element, that is, the atomic number, and the combination of all elements arranged according to the ordinal number.

In addition, there are chemical bonds of each element. If you figure out these, you can create the substance you want in your own flask like an alchemist. "

In everyone's eyes, Yuan Xiao's body glowed.

It's like a god descending.

"Of course," Yuan Xiao looked at his watch, and the time was almost up, "Today is just an opening statement, in fact, every element has its own characteristics.

There are still some complicated things, and I will explain them one by one as the course unfolds in the future.

Also note that I envision our courses will be centered around experimentation combined with theory.

In this way, qualified amateur students can also conduct experiments by themselves.

Perhaps the exploration of new elements in this world was born from your hands. "

Having said that, the get out of class bell rang.

Yuan Xiao closed the handout: "That's the end of this class, please remember to organize your notes when you go back."

He is ready to go.

but!

The whole class of students gathered around.

"Teacher, it's such a coincidence that you interrupted class."

"No, let's talk about ten more elements. Many of the ten you mentioned have already been discovered."

"We want to see elements that haven't been discovered yet, do you have them in your table?"

……

Look, this is the popularity of the best teachers in the country!

Chapter 245 Two Children

The students were very enthusiastic, and the main reason was the content of Yuan Xiao's class just now, which was indeed unheard of.

Combined with what Yuan Xiao said, this is something he brought back from archaeology not long ago, which completely ignited the enthusiasm of the students.

All technology in this world depends on archeology.

For them now, Yuan Xiao is equivalent to discovering a new technology.

Unlike other discoverers, Yuan Xiao did not register a patent, but chose to popularize technical knowledge through lectures.

What concept?

It is equivalent to having hundreds of millions of net worth, all of which are used for charity.

"Teacher," Su Chenyi finally confirmed, "Can the content just said be published on the Internet..."

Yuan Xiao was happy.

It was so sweet.

Post it, it's only posted to attract attention.

Moreover, the announcements made by the students are more convincing than Yuan Xiao's own boasting.

So happy to decide.

Seeing that it was almost time for the next class, the students let Yuan Xiao go.

I can't eat hot tofu in a hurry, anyway, this is just the beginning.

It was a very fulfilling day.

After the class ended, Yuan Xiao left the school.

Now he has a lot of things to do, and he can't drink tea in the office like before.

Yuan Dongzhi is also the first day of class today, Yuan Xiao decided to go and see.

When I came to the Municipal No. [-] Central Primary School, what I saw was Dongfang Xiaoman waving at him.

The tall figure and beautiful appearance formed a landscape at the school gate.

It's a pity that he was paired with a tall and thick guy.

The passers-by were very depressed.

"Are you still used to the winter solstice?" Yuan Xiao stretched out his head to look, but couldn't see anything.

"Just getting ready to enter the class," Dongfang Xiaoman straightened Yuan Xiao's collar, "Parents have retreated, and when there is an opening time, do you want to go in and have a look?"

Yuan Xiao agreed.

"Today is the first day, how is the class going?" Dongfang Xiaoman asked.