Atomic structure GapFill

All matter is made up of  chargesatomsenergycellsionsmolecules, which come in different types, called  moleculesatomsmetalsparticleselementsreactants, represented using symbols which can be found on the  compound sequencereactivity listgroup seriesperiodic tableatomic modelInternet. John Dalton developed his atomic theory, which stated that  atoms are small, cube-shaped particlesatoms in an element are all uniqueatoms cannot be broken into smaller partsall atoms are identicalatoms can be created and destroyedatoms cannot be observed.

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

• the plum pudding model, where the atom is a ball of positive charge with  moleculesionsisotopeselectronsneutronsprotons dotted around...
• Rutherford's model - the  connectivedirectionalmagneticelasticelectronicnuclear model - based on the observations of  beta particlealpha particlehalogenmetallicradiationgamma particle scattering...
• Niels Bohr's model, where electrons orbit the  ionisotopesaltnucleusmetalsubatomic particle...
• and James Chadwick's model, where neutrons are also in the nucleus

Different  alphaomegasubatomicinfraredmagneticultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  1210.52-110, 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  ionsprotonscompoundsbondssaltsisotopes.