Download Date: ______ Current Atomic Models Refining Nuclear Models • In

Name: _______________________
Date: _________
Current Atomic Models
Refining Nuclear Models
• In 1913, Danish physicist, Niels Bohr, refined Rutherford's idea by adding
that the electrons were in orbits around the nucleus. Rather like planets
orbiting the sun. With each orbit only able to contain a set number of
electrons.
• He proposed a ___________________ or Orbit model
The Bohr Model
1. Electrons revolve around the nucleus in specific _____________ (shells),
or __________________________.
• 2. An atom has energy levels. Electrons can only exist in these energy levels,
not in between.
• 3. When an atom is in the ground state, the electrons exist in the energy
levels _____________________________________.
• 4. If an atom receives, energy, the atom becomes excited and electrons
_________________________________________________________.
Ground State
• The lowest energy state of an
atom
• Electrons in the first energy level
have the lowest potential energy
since they are located closest to
the nucleus.
•
Excited State
• An atom with _________________________________ than in the ground
state because electrons have “jumped” to a higher energy level.
• Electrons with higher potential energy occupy orbits farther from the
nucleus. The _____ an electron is from the nucleus, the ______ its energy!
Current Atomic Model
• Electrons act like __________ (because they have a mass) and _________
(because they have certain frequencies corresponding to their energy levels)
• Electrons are located in orbitals around the nucleus that correspond to
specific energy levels
• Electron clouds = orbitals that do not have sharp boundaries, but shows 3D
region where electrons are most probable to be found.
• ____________________ Model or ____________ Model proposed by
Louis de Broglie & Erwin Schrodinger
Valence Electrons
• Electrons that occupy the valence energy level
• Valence Electrons= found in ______________________ energy level
Na 2-8-1
Cl 2-8-7
• Atoms can have a maximum of 8 valence electrons
Lewis Dot Diagrams (Electron Dot Diagrams)
• Represent the arrangement of electrons around the nucleus.
• ____________ are the DOTS.
• _____________ is the symbol.
• ONLY REPRESENT _______________ ELECTRONS!!
• Fill one side first, then one on each side before you pair electrons.
Na
B
O
Mg
Cl
Ne
Si
H
N