Atomic structure GapFill

All matter is made up of  ionsatomsenergycharges, which come in different types, called  atomsreactantsmoleculeselements, represented using symbols which can be found on the  reactivity listperiodic tablegroup seriesInternet. John Dalton developed his atomic theory, which stated that  atoms can be created and destroyedall atoms are identicalatoms cannot be broken into smaller partsatoms 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  moleculesionsneutronselectrons dotted around...
• Rutherford's model - the  connectiveelectronicnuclearelastic model - based on the observations of  beta particlealpha particlehalogenmetallic scattering...
• Niels Bohr's model, where electrons orbit the  saltisotopeionnucleus...
• and James Chadwick's model, where neutrons are also in the nucleus

Different  alphaultrasonicsubatomicomega particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of  -11210.5, 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  protonsionsisotopescompounds.