Posts tagged as atom

How small is an atom?

Just how small are atoms? And what’s inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of the building blocks that make our… Continue Reading →

The Atom

Matter is composed of very small particles which may be atoms, molecules or ions.  The History of the Atom The Greek philosophers first proposed that there were indivisible particles which they called ‘atoms’ which means ‘indivisible’ in Greek. This is where we get the word atom. John Dalton In 1808, an English chemist called John Dalton was… Continue Reading →

Arrangement of Electrons in the Atom

To understand the arrangement of electrons in atoms, Neils Bohor understood the spectra. When white light (eg. sunlight or light from an ordinary electric light bulb) is passed through a prism, the white light is broken up into many different colours. This called a continuous spectrum. But when Bohor carried out this experiment… Continue Reading →