hahaha

When the city lights have not polluted the sky too much, astronomy may be the subject that can stimulate people's interest in knowledge. The next subject may be chemistry. Every day in our life, we are dealing with chemistry. For example, the flame reaction of sodium is probably one of the most common phenomena in life.

It can be said that chemistry is a kind of "knowledge of life" compared with other basic disciplines. Although it is not as systematic as mathematics and physics, it is closely related to our production and life, and it is very obvious, unlike mathematics and physics, which are hidden under phenomena. When I was in middle school, chemistry was the most serious subject I studied. I will read all the chemistry textbooks because chemistry knowledge is very interesting.

All along, I thought that middle school chemistry textbooks were the peak of "interesting chemistry" until I saw "Visual Journey: Magical Chemical Elements" the other day. This is a book written by a collector, which is very interesting, and some knowledge in it makes me feel refreshed. Why would a collector write a book about chemical elements? Because he is an element collector!

In this book, you can not only see all kinds of coins made of pure metals and rare earth elements, but also see the beautiful minerals and magical objects in your past life (such as radioactive health products)-people really knew nothing about radioactivity at that time. )。 However, the most refreshing thing for me is some knowledge I didn't know before. For example, the melting point of gallium is 29.76 degrees Celsius and that of cesium is 28.44 degrees Celsius. What I learned before is that mercury is the only metal that is liquid at room temperature, which is why mercury is "water" instead of "gold". If I had known in middle school that gallium and cesium are also liquids at 30 degrees Celsius, then I would have doubts about it. Because of the low melting point of gallium, the alloy Galinstan of gallium is still liquid at-19 degrees Celsius, so the "mercury" in the thermometer may have been replaced by Galinstan. The densest metal is actually not iridium (all previous books are wrong! ), but osmium, and this density is also calculated theoretically, not measured-there is no perfect sample. However, some elements frustrate element collectors-they are unstable and cannot be prepared. These elements are not necessarily the last elements in the periodic table of elements with large atomic number made in the accelerator, and arsenic is such an element that makes element collectors frustrated.

There are many interesting stories in this book. If I had seen this book in middle school, maybe I would have studied chemistry.