Atomic Structure
Part A: The atom is made up of three small particles (sub-atomic), complete the chart below:
Parts of the Atom
Location
Particle Size
Electric Charge
Symbol
Part B: Standard Atomic Notation
A
mass number = __________________________________
X
Z
atomic number = _________________________________
the number of neutrons is found by: ________________________________________
e.g.
24
12
Mg
# protons =
# electrons =
# neutrons =
Part C: Atomic Structure
Element
Name
Atomic
Number
Atomic
Mass
Standard
Atomic
Notation
phosphorus
27
Al
13
19
26
Number
of
Protons
Number
of
Electrons
Number
of
Neutrons
Part D: Bohr-Rutherford Diagrams
For the first 20 elements in the periodic table, the energy level can hold 2 electrons, and every
energy level after that can hold 8. Elements after the 20th have more complex electron configurations, and we
can disregard them for now. We can make Bohr-Rutherford diagrams for the first 20 elements:
A Bohr-Rutherford (B/R) diagram is used to represent the electron configuration of an atom of any
element. The number of neutron, protons, energy level (orbits) and electrons must be included in all BohrRutherford Diagrams
Number of Electrons:
The electrons are organized into shells in the following order.
up to ____ electrons in the first shell
up to ____ electrons in the second shell
up to ____ electrons in the third shell
up to ____ electrons in the fourth shell
1. Fluorine
2. Aluminum
9 p+
10 n0
13 p+
14 n0
3. Oxygen
8 p+
8 n0
4. Oxygen Ion
8 p+
8n0
Bohr-Rutherford Diagram Practice
Bohr-Rutherford
Diagram of ATOM
Li
N
Na
Bohr-Rutherford
of “Closest”
Noble Gas
Do electrons need to
be gained or lost to
“look like” Noble Gas?
Bohr-Rutherford
Diagram of ION
(charge atom)