organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. Scientists use the periodic table to quickly refer to information ...

We know that matter is made up of particles called atoms and that an element ... structure of sodium can also be shown in a diagram. Each dot represents an electron. Since the atomic number ...

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find ... emitted by the radioactive element radium) at a sheet of gold foil only 1/3000 of an inch thick, and tracing ...

When world-leading teams join forces, new findings are bound to be made. This is what happened when quantum physicists from ...

One feature of compounds made with transition metals is their intense colour. There are many examples in nature, including ...

For almost a century, measurements have indicated that a significant proportion of matter in the universe consists of unknown dark matter, which ...

Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered ...