Atomic Blueprint Anchor Chart
Unit 2: Matter & Atoms
Atomic Blueprint
Ref: MS-PS1-1
ANCHOR CHART 01
The Bohr Model
Visualizing Carbon-12
Bohr models show electrons orbiting the nucleus in fixed paths called shells or energy levels.
e⁻
e⁻
e⁻
e⁻
e⁻
e⁻
n
n
n
n Neutron
e⁻ Electron
Tile Info
Reading the Element
6 C Carbon 12.011
Atomic Number
= # of Protons (Identity)
Element Symbol
Abbreviated name
Atomic Mass
= Protons + Neutrons
Quick Math
Atomic Formulas
Find Neutrons: Mass - Protons
Neutral Atom: Protons = Electrons
The Subatomic Lineup Core Properties
| Particle | Charge | Mass (amu) | Location | Role |
|---|
| Proton | +1 (Positive) | 1 | Inside Nucleus | Defines Element's Identity |
| Neutron | 0 (Neutral) | 1 | Inside Nucleus | Glues the Nucleus Together |
| Electron | -1 (Negative) | ~0 (Negligible) | Electron Cloud / Shells | Responsible for Bonding |
Pro Tip: The Nucleus holds 99.9% of the atom's mass, but occupies a tiny fraction of its volume!
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Unit 2: Matter & Atoms
Atoms vs. Molecules
Ref: MS-PS1-1
ANCHOR CHART 02
Level 1
Single Atom
The smallest unit of a chemical element that still keeps the properties of that element.
He
Helium Atom (He)
Level 2
Element Molecule
Two or more of the SAME type of atoms chemically bound together.
O
O
Oxygen Gas (O₂)
Level 3
Compound
Two or more DIFFERENT types of atoms bonded chemically in a fixed ratio.
H
O
H
Water Molecule (H₂O)
Formula Breakdown
Anatomy of a Chemical Formula
Formulas show you exactly what elements are in a molecule and how many atoms of each element exist.
3
H
2
O
C
Coefficient = Number of Molecules
Multiplies everything in the formula. Here, there are 3 separate water molecules total.
S
Subscript = Ratio of Atoms
Tells you how many atoms of that specific element are in one molecule. No subscript means 1 (like Oxygen).
Interactive Challenge
Let's Calculate: 3 H₂O
Can you count how many of each atom exist in this entire formula?
Hydrogen 3 × 2 = 6 Atoms
Oxygen 3 × 1 = 3 Atoms
Remember: All compounds are molecules, but not all molecules are compounds!
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