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Atoms - Coggle Diagram
Atoms
made up of
SUBATOMIC PARTICLES
...
Protons
positively charge, found in the nucleus
(p)
physical properties
Neutrons
no charge, found in the nucleus
(n)
Electrons
negatively charged, found in the orbit
(e)
chemical bonding
Theories
Democritus (5 BC)
"atomos"
which means
uncuttable
John Dalton
Dalton's Atomic Theory (1808)
Studies & Models
Joseph John Thomson
Electrons
Cathode Ray Experiment
"an atom is positively charged but comes with electrons"
Plum Pudding Model
Ernest Rutherford
Protons and Nucleus (1910)
Alpha Scattering Experiment
"an atom has a dense center and surrounded by an empty space"
Neils Bohr
Electron Shells
"electrons around the nucleus are in specific shells"
James Chadwick
Neutrons (1932)
John Dalton
"an atom is like a solid ball"
Variations
Isotopes
greater number of neutrons
the atomic mass indicated in the periodic table is different
has radioactive properties
Ions
charged
Cation
positively charged, loses electrons
Anion
negatively charged, gains electrons
Molecules
combination of atoms
Diatomic (2 atoms)
Polyatomic (more than 2 atoms)