Atom Secrets Study Guide
Study Guide
Structure of the Atom & The Periodic Table
Name:
Period:
Periodic Table Regions
Zigzag Staircase
H He B Al Si Ge As Sb Te Po At
Metals (Left) Metalloids (Staircase) Nonmetals (Right + H)
Subatomic Particle Reference
| Particle | Charge | Mass | Location |
|---|
| Proton (p+) | +1 (positive) | 1 amu | Nucleus |
| Neutron (n0) | 0 (neutral) | 1 amu | Nucleus |
| Electron (e-) | -1 (negative) | ~0 amu | Electron Shells |
1 Part 1: Anatomy of an Atom
Label terms: nucleus, proton, neutron, electron
Particle (+):
Particle (0):
Particle (-):
Center Structure:
Atom Identification
Count particles in the diagram to identify the element:
Protons count:
Electrons count:
What element is represented?
Symbol:
Name:
2 Part 2: Periodic Table Tile Decoding & Subatomic Math
Calculate all values for neutral atoms
74
W tungsten
183.84
Atomic Number:
# of Protons:
Atomic Mass:
# of Neutrons:
Mass # (rounded):
# of Electrons:
28
Ni nickel
58.693
Atomic Number:
# of Protons:
Atomic Mass:
# of Neutrons:
Mass # (rounded):
# of Electrons:
Page 1 of 2 • Atom Structure & Subatomic Calculations Tip: Mass Number = Protons + Neutrons (Always round atomic mass to nearest whole number!)
Section 2
Bohr Models & Periodic Table Organization
Study Guide Review • Page 2
Electron Shell Capacities (2-8-8-2 Rule)
• 1st Energy Level (innermost): max 2 electrons
• 2nd Energy Level: max 8 electrons
• 3rd Energy Level: max 8 electrons
• 4th Energy Level: max 2 electrons (elements 19–20)
Table Navigation & Classification
• Periods (Rows 1–7): = # of electron energy rings
• Groups (Columns 1–18): = same # of valence electrons
• Classes: Metals (left), Metalloids (staircase), Nonmetals (right)
3 Part 3: Identify the Element from the Bohr Model
Count total electrons or use rings + valence
6 p+ 6 n°
Total e-:
Element:
10 p+ 10 n°
Total e-:
Element:
13 p+
Total e-:
Element:
4 Part 4: Draw the Bohr Model for Potassium (K)
Atomic # = 19, Mass # = 39
p = ___
n = ___
Draw dots (•) for 19 electrons across 4 rings
Drawing Instructions:
-
- Write the number of protons (p+) and neutrons (n0) in the nucleus circle.
-
- Fill rings from inside out: Ring 1 (max 2), Ring 2 (max 8), Ring 3 (max 8), and Ring 4 (valence e-).
-
- Draw electrons as clear dots (•) placed evenly in pairs on each ring.
5 Part 5: Periodic Table Analysis & Element Classification
Determine properties using the periodic table
| Element | Group # | Period # | # of Valence e- | # of Energy Rings | Classification (Metal / Nonmetal / Metalloid) |
|---|
| Potassium (K) | | | | | |
| | | | | |
|
|
|
|
| Oxygen (O) |
|
|
|
|
|
| Silicon (Si) |
|
|
|
|
|
Page 2 of 2 • Bohr Models, Groups & Periods ✓ Remember: Period # = # of Electron Shells | Group # = Valence Electrons (outer shell)
Atom Secrets Answer Key
Teacher Answer Key & Scoring Guide
Structure of the Atom & The Periodic Table
Official Key • Page 1
Periodic Table Regions
Zigzag Staircase
H He B Al Si Ge As Sb Te Po At
Metals (Left) Metalloids (Staircase) Nonmetals (Right + H)
Subatomic Particle Reference
| Particle | Charge | Mass | Location |
|---|
| Proton (p+) | +1 (positive) | 1 amu | Nucleus |
| Neutron (n0) | 0 (neutral) | 1 amu | Nucleus |
| Electron (e-) | -1 (negative) | ~0 amu | Electron Shells |
1 Part 1: Anatomy of an Atom — Solutions (5 Points)
✓ Correctly Labeled
Particle (+):
proton
Particle (0):
neutron
Particle (-):
electron
Center Structure:
nucleus
Atom Identification
Counting particles to determine identity:
Protons count: 3
Electrons count: 3
Element Answer:
Symbol:
Li
Name:
Lithium
2 Part 2: Periodic Table Tile Decoding & Subatomic Math — Solutions (12 Points)
✓ APE MAN Arithmetic
74
W tungsten
183.84
Atomic Number:
74
# of Protons:
74
Atomic Mass:
183.84
# of Neutrons:
110 (184-74)
Mass # (rounded):
184
# of Electrons:
74
28
Ni nickel
58.693
Atomic Number:
28
# of Protons:
28
Atomic Mass:
58.693
# of Neutrons:
31 (59-28)
Mass # (rounded):
59
# of Electrons:
28
Teacher Guide • Page 1 Solutions ✓ A = P = E (74=74=74, 28=28=28) | M - A = N (184-74=110, 59-28=31)
Teacher Solutions
