Siyapath
Sign up

Lesson: Chapter 3 — The Structure of Matter

3.3. The modern periodic table 1 of 6

Why the elements are classified

More than 115 elements have been discovered. Studying the properties of each one separately would be an enormous task.

Scientists around the world collect information about the elements and their compounds without pause. That body of information is so large and so varied that no one could hold all of it in memory.

So what do you do with too many facts?

You look for an order in them. Many scientists tried to classify the elements by many different schemes, and the finest result of that effort is the periodic classification.

The first periodic table for classifying the elements was presented by the Russian scientist Dmitri Mendeleev.

What this shows

What a good classification buys you is this: instead of learning 115 separate stories, you learn where an element sits — and its position tells you a great deal about how it will behave. The rest of this section is about reading that position.