Chemistry Atomic Models

Niels Bohr

Who made the Planetary Model?

Ernest Rutherford

Who created the nuclear model?

J.J. Tomson

Who created the Plum Pudding model?

Erwin Schrodinger

Who created the Quantum Model?

John Dalton

Who created the Solid Sphere Model

No nucleus, didn't explain later experimental observations.

Plum Pudding Model's problem

None according to the card sort.

Quantum Model problem

Atoms aren't indivisible-they're composed from subatomic particles

Solid Sphere model problem?

Moving electrons should emit energy and collapse into the nucleus; model did not work well for heavier atoms.

Planetary Model problem

What is the most accurate model of the atom?

Quantum Model

What is the pro of the Quantum model?

Electrons do not move in orbits; their position is uncertain.

Solid Sphere Model

Dalton drew upon the Ancient Greek idea of atoms (the word 'atom' comes from the Greek 'atomos' meaning indivisible). His theory stated that atoms are indivisible, those of a given element are identical, and compounds are combinations of different types of atoms.

Plum Pudding Model

Thomson discovered electrons (which he called 'corpuscles') in atoms in 1897, for which he won a Nobel Prize. He subsequently producted the 'plum pudding' model of the atom. It shows the atom as composed of electrons scattered throughout a spherical cloud of positive charge.

Planetary Model

Bohr modified Rutherford's model of the atom by sitting that electrons moved around the nucleus in orbits of fixed sizes and energies. Electron energy in this model was quantized; electrons could not occupy values of energy between the fixed energy levels.

Quantum Model

Schrodinger states that electrons do not move in set paths around the nucleus, but in waves. It is impossible to know the exact location of the electrons; instead, we have 'clouds of probability' called orbitals, in which we are more likley to find an electron.