I have a full-time hero system

I hope that every student will maintain the best attendance status, because what I want to talk about must be something extraordinary. "

As the class monitor, He Jiaxue raised her hand: "Then teacher, don't say anything, just tell me what class you are going to have."

Yuan Xiao is very satisfied, what is needed is such a student who likes to go straight in and out.

Alright, the deity will let you enter the main body immediately.

He turned around and wrote the word "chemistry" on the blackboard.

Xia Wanqing despises: "Teacher, isn't this chemistry class just about studying molecules?"

"It can be said that," Yuan Xiao smiled, "but do you know what the essence of so-called chemistry is?"

The crowd was speechless.

"As early as the era of ancient civilizations, human beings just came to understand the world, and some very common behaviors actually included chemistry," Yuan Xiao began to explain, "For example, using clay to make pottery.

There are also wine brewing, and the clothes of various colors you wear, which we called dyeing at the earliest.

This is the knowledge obtained by early humans based on the most basic and primitive exploration of nature, which can also be said to be obtained from actual life experience.

And all the applications here use the knowledge of chemistry. "

The words attracted the attention of all the students.

Ancient civilization, what did Yuan Xiao mean by what Yuan Xiao said.

"Teacher," Fang Xuyao ​​raised his hand to ask, "Do you mean the civilization before us by the ancient civilization?"

"No," Yuan Xiao waved his hand, "It refers to the earliest and most primitive era of our human beings."

"If that's the case," Fang Xuyao ​​frowned, "does the teacher have evidence that can provide the so-called early age of human beings?"

There is no evidence, the archeology in this world, the oldest thing, also existed more than 200 years ago.

There is no earlier nor ancient.

Yuan Xiao smiled: "This question is very good, it involves the evolution of human civilization.

Everyone now knows that the civilization of our world is what it is now when you open your eyes.

So, don't you have any doubts?

Earlier civilizations, how did they evolve to the present? "

Everyone is thoughtful.

"So, what I'm talking about here can be said to be a hypothesis." Yuan Xiao raised his index finger, "For human civilization, the hypothesis of the process from simple and simple to complex.

And chemistry runs through everything in this process. "

Chapter 243 The Key to the Different Elements

Here Yuan Xiao made a conservative assumption.

The civilization of this world has a history that can be traced back only a few hundred years.

Moreover, from the beginning of civilization, it stood on a relatively high level of technological application.

A very modern, arguably even futuristic world.

However, to Yuan Xiao's surprise, he could not find any earlier records.

It's like a person sleeping in a cryogenic cabin for hundreds of thousands of years, and after waking up, he can use the existing technology at his fingertips.

He doesn't need to think about the principles of these technologies and their sources. .

All you need is to know how to use it.

It looks very convenient at first glance, but there are also huge hidden dangers.

That is such an applied civilization, it is very difficult to progress.

Once there is any natural or man-made disaster, the destruction is an instant thing.

Human beings in the world have realized the fragility of civilization.

This is the reason for the current archaeological efforts.

Therefore, when Yuan Xiao made such an assumption, it immediately attracted the attention of all the students.

That's right, no one has ever thought about how the current technologies are transformed from the original.

"We can assume that the development of chemistry is a common progress with mankind. This must be a long-term accumulation." Yuan Xiao continued his point of view.

Not perfect, but the students had no way to refute it.

From the perspective of the technology tree, Yuan Xiao's words have a certain basis.

All technologies are developed by accumulation.

"This is the human understanding of chemistry that I estimated in the earliest era," Yuan Xiao smiled. "Actually, everyone should be able to accept this level of chemistry."

The essence of chemistry is actually the interaction and transformation between elements.

This is how clay becomes porcelain.

The students nodded.

"Then, let's continue the hypothetical process," Yuan Xiao said step by step, "At the beginning, people found that the soil would change, or other things would change.

Whether to a certain extent, will they have bolder ideas.

Such as turning a stone into gold. "

The whole class was in an uproar.

Xia Wanqing raised her hand: "Teacher, what you said is simply impossible to achieve."

"Yes," Yuan Xiao agreed, "but think about it, this is the answer we now know.

However, do you think this is an absolute fact?

After all, chemistry has not come to its end. "

Xia Wanqing was speechless.

"The emergence of alchemists is predictable," Yuan Xiao knew the development and changes of chemistry, and he spoke eloquently, "Their purpose is to refine immortality elixir, or gold.

Or possibly other very rare substances. "

"This process is understandable," Su Chenyi affirmed, "When a human opens a new door, they must be curious about everything inside, and bold and extensive exploration is predictable."

"Yes," Yuan Xiao praised, "This can also be said to be an important process from primitive perception to automatic hands-on research.

Afterwards, it is conjectured whether there will be any qualitative changes after accumulating experiments and huge data. "

Fang Xuyao ​​nodded: "We can accept the process from quantitative change to qualitative change."

"The final result of qualitative change leads to the emergence of chemistry as an independent discipline," Yuan Xiao began to conclude, "We can predict that such a complicated process cannot be brought about overnight."

Ye Qingdai was thoughtful: "I know that modern medicine intersects with many aspects of chemistry.

What the teacher said is that our exploration of the nature of chemistry is not limited to the existing excavated technologies, but more of an exploration of its extension. "

"Very good," Yuan Xiao was very satisfied, the students in Class [-] are very smart, "That is to say, if we only apply superficially, we don't know the core problem of chemistry.

Then our thorough framework for the branch of chemistry will be difficult to achieve. "

Imitation and application, after all, is to use the original technology.

And only through self-discovery can one enter the door of chemistry.

"Then here comes the question," Xia Wanqing said that she could actually understand, "What is the core problem of chemistry that the teacher said."

Yuan Xiao pressed one hand on the blackboard.

"Next, all the students in the class should pay attention," Yuan Xiao kept smiling, "The first point of the core problem of chemistry is the elements.

Tell the teacher what you saw on the blackboard. "

Is this a test of our IQ?

The students are a little confused.

Isn't it the teacher's hand?

But for a while, no one dared to answer.

"Teacher," Xia Wanqing finally raised her hand, "Is your hand the correct answer?"

"Very correct," Yuan Xiao raised his hand, "Sometimes the simplest and most primitive question is the most hesitant answer. I hope everyone will remember this feeling."

Being a fan of the authorities probably means something like this.

"Then here comes the question," Yuan Xiao raised his right hand, "Why do you think the answer is my hand, not something else."

Everyone was stunned.

This is not nonsense, what I see is your hand.

But there are also students who think deeply.

Fang Xuyao ​​was the first to discover the problem: "Teacher, what you mean is how we should distinguish different elements, or in other words, what is the basis for distinguishing them.

Is it right? "

Yuan Xiao gave everyone a thumbs up.

Proud index +777, +666, +888...

A successful harvest, okay.

Xiaobai's educational world is really great.

"What Xu Yao said is very correct," Yuan Xiao wrote two letters on the blackboard, "H and O, based on everyone's knowledge, everyone knows what elements they are."

In the current world, there is still some knowledge of chemistry at this point.

Li Mulan also opened her eyes, surrounded by immortal energy, she actually opened her mouth to answer: "It's hydrogen and oxygen atoms."

"That's right," Yuan Xiao applauded, "Then let me ask everyone why hydrogen atoms are hydrogen atoms instead of oxygen atoms."

Why are you talking nonsense again.

This is how the world was born.

They said there was nothing they could do.

"Teacher," Su Chenyi was taking notes, "You mean, you found a way to distinguish them."

The crowd was in an uproar!

If this is true, it would be a major event in the history of world chemistry.

How did you find it.

"Xiao Chenyi is very correct," Yuan Xiao kept smiling sweetly, "During this archaeological operation, the teacher was very lucky to find the solution to this problem.

Then, the fundamental reason why the elements are different lies in the difference in their proton numbers. "

The crowd was stunned.

"The number of protons may be unfamiliar to everyone. In fact, it can also be said to be the number of protons in the nucleus. This nucleus means the nucleus of an atom." Yuan Xiao turned around and began to write, "Next, there is a very important concept. I hope that every student Write it all down."

Yuan Xiao wrote an equation on the blackboard.

Number of protons = number of nuclear charges = number of electrons outside the nucleus = atomic number.

He gently put down the chalk in his hand, "This is the key to the different elements."

Chapter 244 The Periodic Table of Elements Officially Published

I have never heard of it, and everyone said it was incredible.

The difference in the number of protons leads to the difference in elements, which means that Yuan Xiao redefined the definition of matter.

The question is, does this definition fit the facts.

But this is not something the students can question, they can only show puzzled eyes.

Yuan Xiao was very satisfied with such puzzled eyes.

Yuan Xiao doesn't know how much he has learned about microcosm in this world, and whether he can study atoms.