Model of the atom GapFill

All matter is made up of atoms charges energy molecules , which come in different types, called atoms metals elements molecules , represented using symbols which can be found on the Internet atomic model group series periodic table . When these react together, compounds protons noble gases mixtures are formed, which have formulae to show the percentage ratio charge size of each element. Mixtures Metals Pure substances Halogens contain multiple elements or compounds, and can be separated bonded fused reacted using filtration, distillation, crystallisation and chromatography.

Over time, different scientists have developed new models of the atom. These include:

• the plum pudding upside-down pineapple cheesecake strawberry shortcake model, where the atom is a ball of positive charge with electrons dotted around
• Rutherford's model - the magnetic elastic electronic nuclear model - based on the observations of alpha particle beta particle radiation halogen scattering
• Theodore Roosevelt Albert Einstein Neil Armstrong Niels Bohr 's model, where electrons orbit the nucleus
• Alexander Fleming James Dalton Francis Drake James Chadwick 's model, where neutrons are also in the nucleus

Different ultrasonic omega alpha subatomic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of 0.5 2 -1 1 , and electrons (negative particles) have a very small mass. The relative atomic mass of an atom is the weighted average mass of all of the element's compounds protons isotopes ions .