Probable the atom of the element ununoctium.
First of all Diamond Isn't even an element, Platinum is the most expensive element of all.
the most expensive element is a synthetic element which is Californium. It costs approximately 2.7 billion dollars per 100g. The one which isn't synthetic and the most expensive is lutetium and it costs $10000 per 100g.
An atom.
A fluorine atom has the greatest electronegativity of any atom.
hydrogen
On a whole, rolex watches are some of the most expensive in the world.
boron
The element hydrogen is the simplest atom and the most abundant in the universe. It is composed of one proton and one electron.
the nucleus
An electronegative atom is an atom that can attract a bonding pair of electrons from another atom. Fluorine is the most electronegative element.
The most common change in an atom of the element calcium is the loss of the two electrons in the valence shell of atom,resulting ina calcium cation.
The central atom in a molecule is typically the one that is most electronegative.