Name:________________________
Bohr-Rutherford Diagrams
Atoms
 The nucleus contains _________________ and ___________________, and makes up most of the mass of
the atom.
 Negatively charged ____________________ orbit around the nucleus.
RECALL
# Protons = ____________________________________________________________________
# Electrons = ___________________________________________________________________
# Neutrons = ___________________________________________________________________
Problem #1: Determine the number of protons, electrons and neutrons in the following
Fluorine
Calcium
p=
p=
e=
e=
n=
n=
 Electrons exist in orbitals (energy levels). Each orbital can only hold a certain number of electrons and each
orbital must be filled before electrons are placed into the next orbital
o The first orbital can hold up to _____ electrons
o The second shell can hold up to _____ electrons
o The third shell can hold up to ______ electron
Problem #2: Draw the Bohr Rutherford Diagram for the following atoms
Fluorine
Calcium
Ions
 When an atom is forms an ion, it must empty or fill up the ___________level with electrons.
Problem #3: Draw the Bohr Rutherford Diagram for the following ions
Fluorine
Calcium
Electron Dot Diagrams
 Electron Dot Diagrams are another way to represent atoms and ions
 The symbol of the atom is written in the center
 Only the outer orbital of electrons are included in the diagram
 The electrons are drawn in four pairs around the symbol, one electron is drawn on each side before you
pair them up
Problem #4 : Draw the Electron Dot Diagram of the atom and ion for the following
Ion
atom
Fluorine
Calcium