He wrote the properties of the elements on pieces of card and rearranged them until he realised that, by putting them in order of increasing atomic weight ... middle of the table is called ...

So, today we're going to look at the periodic table. That thing that you see behind ... For example, one oxygen atom combines with two hydrogen atoms to make water (H₂O). A Russian scientist ...

Aluminum is a metal in group IIIA of the periodic table with atomic number 13, an atomic weight of 26.982, and a density of 2.70 ... At room temperature Aluminum has the face-centered-cubic crystal ...

Silicon is a semiconductor in group IVA of the periodic table with atomic number 14, an atomic weight of 28.086, and a density of 2.33 Mg/m 3. It melts at 1410 C. The electronic configuration of the ...