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Transcript
QUANTUM MECHANICAL
MODEL OF THE ATOM
ESSENTIAL QUESTION: WHAT IS THE CURRENT MODEL OF THE ATOM?
THE PROBLEM WITH BOHR:
Pros
Cons
Explained hydrogen’s line Doesn’t explain the line
spectrum.
spectra of any other
element.
Showed that an atom has Data indicates that
quantized (specific)
electrons don’t move
energy levels.
around nucleus in circular
orbits.
IT WAS THEREFORE ASSUMED IT WAS WRONG.
QUANTUM MECHANICAL MODEL
• Current model of the atom.
• Based on evidence from a field of study called quantum
mechanics.
• Very complicated equations are used to describe areas in
space around the nucleus where e- are likely to be found.
• These areas are called orbitals. Several types – classified
by shape.
A WAVE FUNCTION FROM QUANTUM MECHANICS:
PROGRESSION OF ATOMIC THEORY:
TYPES OF ORBITALS:
S – orbitals
d – orbitals
p – orbitals
ORBITALS