Continuous matter
Aristotle (384–322 BC)
Quantum model - Orbitals
Schrodinger-Heisenberg
Nuclear model (empty sphere)
E. Rutherford - 1911
Indivisible atoms
Atomic Theory (Dalton) - 1803
Neutron discovery
Chadwick - 1932& Modern Theory
Planetary model - orbits
N. Bohr - 1913
Plum pudding model
J.J. Thomson - 1904
Atoms
Democritus (400-300 B.C.)
4th ESO - Scientia Dénia
EVOLUTION OF THE ATOMIC MODEL
After the gold foil experiment, Rutherford theorized that electrons describe orbits about a tiny positive nucleus, like planets revolving around the Sun.
Heisenberg's uncertainty principle establishes the impossibility of determining the position and velocity of a particle, we only know the probability of finding it in a certain spot.Change from the concept of orbit to orbital Orbital : region of space where there is a high probability of finding an electron.
Neutron is discovered in 1932 by ChadwickAtoms of one element have the same number of protons but they can have different number of neutrons: isotopes
- The electrons spin around the nucleus in defined orbits: quantisation- It explains the discontinuous spectra
- Matter is made up of atoms- Atoms of an element are identical - Atoms of different elements are different in weighs and chemical properties - Different elements combine to form compounds - Atoms cannot be created or destroyed
Since a negative particle (electrons) were discovered, atoms are uniform spheres of positively charged matter in which electrons are embedded.
He believed that there were four elements that everything was made up of: earth, water, air, and fire.
Everything is composed of "atoms," which are indivisible. Atoms are indestructible and have always been and always will be in motion. There is an infinite number of atoms and of kinds of atoms, which differ in shape and size.
Continuous matter
Aristotle (384–322 BC)
Quantum model - Orbitals
Schrodinger & Heisenberg - 1926
Nuclear model(empty sphere)
E. Rutherford - 1911
Indivisible atoms
Atomic Theory (Dalton) - 1803
Neutron discovery
Chadwick - 1932& Modern Theory
Planetary model - orbits
N. Bohr - 1913
Plum pudding model
J.J. Thomson - 1904
Atoms
Democritus (400-300 B.C.)
4th ESO - Scientia Dénia
EVOLUTION OF THE ATOMIC MODEL
