What is a pedestal arrangement?

arrangement (an organized structure for arranging or classifying)

A pedestal is a stand for a vase.

The most important difference between Mendeleev's table and today's table is that the modern table is organized by increasing atomic number, not increasing atomic weight. Why was the table changed?...

In a liquid, atoms are spaced a little apart. They're spaced a little farther apart than solids, but a little closer than gases. They're "in between". They can generally move and "flow" past each...

I dunno bra don't ask mei don't no everythin