Atomic structure GapFill

All matter is made up of energy atoms ions charges , which come in different types, called elements reactants atoms molecules , represented using symbols which can be found on the periodic table group series Internet reactivity list . John Dalton developed his atomic theory, which stated that atoms cannot be observed atoms can be created and destroyed all atoms are identical atoms cannot be broken into smaller parts .

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 electrons ions neutrons molecules dotted around...
• Rutherford's model - the electronic elastic nuclear connective model - based on the observations of metallic beta particle halogen alpha particle scattering...
• Niels Bohr's model, where electrons orbit the nucleus isotope salt ion ...
• and James Chadwick's model, where neutrons are also in the nucleus

Different alpha subatomic omega ultrasonic particles have different masses and charges. Protons (positive particles) and neutrons (neutral particles) have a mass of -1 1 12 0.5 , 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 isotopes compounds protons ions .