Inside the Atoms & Chemical Formulas 5E Lesson
The 5E instructional model walks students through five phases: Engage, Explore, Explain, Elaborate, and Evaluate. It flips the traditional lecture-first sequence on its head. Students explore a concept hands-on before you ever explain it, which means by the time you do explain it, they have something to hook the vocabulary onto.
I switched to the 5E model years ago and stopped going back. Kids retain more, ask better questions, and stop staring at me waiting to be told the answer. The Atoms & Chemical Formulas 5E Lesson is built on this framework from start to finish. Here's how it plays out across the five phases.
🎯 Engage
Day one is a teacher-led hands-on counting activity. Each small group gets a periodic table reference page, a set of common chemical formula cards (H₂O, CO₂, NaCl, NH₃, CaCO₃, C₆H₁₂O₆), and a student sheet with a chart for each formula. Following the teacher directions, they identify each chemical symbol using the periodic table, then count how many atoms of each element are in every formula. No vocabulary yet. Just a periodic table, a formula, and a counting question.
By the end of the period, kids have a completed atom-count chart for every formula on their student sheet, in their own handwriting, and they can talk through how they figured out the count. Nobody has heard a vocabulary lecture yet. That's the point. They're walking into the rest of the unit with a working mental model, not a memorized definition.
What's included in the Engage:
- Teacher directions for the periodic-table-and-formula counting activity
- Printable student observation sheet with formula cards
- Answer key for the discussion questions
- Four learning objective slides (standard verbatim, "Use the periodic table" highlighted, "I CAN...", and "WE WILL...")
- An illustrated Chemistry Word Wall in English and Spanish covering the full unit vocabulary
🔬 Explore
The Atoms & Chemical Formulas Station Lab is the heart of the Explore phase. Students rotate through 8 stations (plus a 9th challenge station for early finishers) over one class period. The Station Lab is split into four input stations (where kids take in new information) and four output stations (where they show what they learned).
The four input stations:
- 🎬 Watch It! — Students watch a short video on the periodic table, chemical symbols, and how to read a chemical formula, then answer guided questions.
- 📖 Read It! — A one-page reading passage at two differentiated levels, with a Spanish version included.
- 🔬 Explore It! — Students physically build molecule models using colored beads or blocks to match given chemical formulas (H₂O, NH₃, CO₂) and count the atoms.
- 💻 Research It! — Reference cards with a kid-friendly periodic table, common compounds, and a how-to guide for subscripts and coefficients.
The four output stations:
- 📋 Organize It! — A card sort where students match chemical formulas to their atom counts (number of each element and total atoms).
- 🎨 Illustrate It! — Students draw the atomic-level diagram of a given chemical formula, labeling every atom with its symbol.
- ✍️ Write It! — Three open-ended questions in complete sentences (this is where you see who really gets it).
- 📝 Assess It! — A short formative check with multiple choice and a fill-in-the-blank vocabulary paragraph.
Print and digital versions are both included. If you want the full breakdown of what happens at every single station, what students produce, and how to set it up, that's in our dedicated Station Lab post.
→ Read the full Atoms & Chemical Formulas Station Lab walkthrough 8 stations, materials list, teacher tipsThe Station Lab is included in the full 5E lesson. You don't need to buy it separately if you're getting the whole unit.
📚 Explain
Here's the real payoff of doing the Engage and Explore before the Explain: by the time kids hit this phase, they've already counted atoms in real formulas and built molecule models with their hands. They have a working understanding before you ever start naming things. The discussions get deeper, the questions get sharper, and you spend less time defining and more time pushing their thinking.
The Atoms & Chemical Formulas Presentation walks 7th graders through the full scope of TEKS 7.6B, one concept at a time. The deck opens with a quick reset on matter (atoms are the smallest form of matter and make up elements, and elements combine to form compounds and molecules). From there it builds the chemical-symbol convention students will use the rest of the year: every chemical symbol begins with one capital letter and sometimes has a second lowercase letter. Iron is Fe. Sodium is Na. Oxygen is O. The deck pairs each example with the periodic table location so kids start linking symbols to the table itself.
From there the deck digs into the periodic table as more than a chart. It's organized to help us predict how elements combine. Students see the three main classifications (metals on the left, metalloids along the staircase, nonmetals on the right) and learn that metals tend to bond with nonmetals to make compounds, while nonmetals also bond with other nonmetals to make molecules. The deck pulls in ions, cations (positive), and anions (negative) so students see why atoms combine in fixed ratios in the first place. Then the lesson switches into reading mode: a chemical formula is an expression that tells you exactly which elements and how many atoms are in a molecule. The deck shows H₂O and asks the same question I asked my first class: how many atoms of each are in this formula? Then it teaches the rule.
The rule is subscripts. A subscript is the small number that comes after a chemical symbol, and it tells you how many atoms of that element are in the molecule. If there's no subscript, there's exactly one atom. H₂O has two atoms of hydrogen and one atom of oxygen. C₂H₅NO has 2 carbons, 5 hydrogens, 1 nitrogen, and 1 oxygen. Students work through example after example. Once subscripts click, the deck introduces parentheses: Al₂(SO₄)₃ means everything inside the parentheses gets multiplied by the subscript outside (3 sulfurs and 12 oxygens, plus 2 aluminums). Then it adds coefficients, the big number in front of the whole formula, which tells you how many full molecules you have. 2H₂SO₄ means two complete molecules of H₂SO₄, so you multiply every atom count by 2.
What makes the Atoms & Chemical Formulas Presentation different from a typical chemistry slideshow is that kids are doing something on almost every slide. It's not a lecture deck. It's a participation deck. "Your answer:" prompts appear on most slides, Brain Breaks reset attention every few slides (in one, students pretend to be aluminum or oxygen atoms based on their birth month and form a real Al₂O₃ molecule in the hallway), and Quick Action INB tasks (count-the-atoms wheels, formula-matching, subscript-and-coefficient pyramid building) show up throughout. Think About It prompts push deeper into bigger ideas like why scientists use stick-and-ball models to represent chemicals and predicting whether a formula will need subscripts, coefficients, or both based on a given atomic model. The deck closes with a Check for Understanding tied back to the Essential Questions: How can we use the periodic table to identify the atoms within a chemical formula? and How can we identify the number of each kind of atom within a chemical formula?
The Explain materials in this product include:
- An editable 38-slide Presentation at two differentiated levels (Dependent and Modified), works in PowerPoint or Google Slides
- A guided fill-in-the-blank student notes handout that mirrors the Presentation, with answer key
- A Paper Interactive Notebook (English and Spanish) students cut, fold, and glue into their notebooks
- A Digital Interactive Notebook at both levels with answer keys, for 1:1 classrooms or Google Classroom
The Explain runs across two class periods. The built-in Think About It prompts are where the real discussion happens, so let those breathe.
🛠️ Elaborate
The Elaborate phase is where students stretch what they learned about atoms and chemical formulas and put it into a project of their choosing. In this 7th grade chemistry lesson, that's a Student Choice Project board with six different project options plus a "design your own" pathway.
Students might design a how-to poster that walks a younger student through counting atoms in any chemical formula (with subscripts, parentheses, and coefficients), build a 3-D model of glucose (C₆H₁₂O₆) using colored beads and label every atom, write a children's book where a chemical symbol and a subscript meet and become a molecule, or record a short video showing how to use the periodic table to identify the elements in three common compounds. There are options for kids who love to write, kids who love to draw, kids who love to build, and kids who love to perform. Whatever the project, the point is the same: students apply the periodic table, chemical symbols, subscripts, and coefficients to a real-world artifact instead of a worksheet.
Choice is the whole point. By letting students pick how they show their thinking, you get more authentic work for TEKS 7.6B and you actually get to see what they understand about atoms and chemical formulas.
The rubric (the part teachers actually want)
Every project, no matter which option a student picks, is graded on the same 100-point rubric. Five categories at 20 points each:
- Vocabulary (20 pts) — At least four words from the lesson are used in context.
- Concepts (20 pts) — At least two key concepts from the lesson are referenced.
- Presentation (20 pts) — The project grabs attention and is well-organized.
- Clarity (20 pts) — Easy to understand. Free of typos.
- Accuracy (20 pts) — Drawings and models are accurate. The science is right.
The rubric uses a minus / check / plus shorthand on every row so you can grade a stack of projects quickly without re-reading every criterion.
Two differentiated versions in one file
The standard version is for students ready for independent application of chemical formula counting. The Reinforcement version is for students who need additional vocabulary or concept support. Three of the six options are swapped for projects with a tighter vocabulary tie-in, and "design your own" is replaced with "collaborate with the teacher" so kids aren't pitching cold.
✅ Evaluate
The Evaluate phase wraps the unit with a formal assessment. It's not all bubble-in. Several questions hand students a chemical formula and a periodic table snippet and ask them to identify the elements and count the atoms.
The full assessment has 12 questions across five formats:
- Multiple choice (4 questions) covering chemical symbol rules, subscript meaning, coefficient meaning, and the difference between subscripts and coefficients
- Hotspot / visual (2 questions) where students click on the subscript in a labeled formula and circle the formula that contains the most total atoms
- Multiselect (2 questions) where students pick all of the formulas that contain a given element from a mixed list of chemical formulas
- Short answer (2 questions) on how to find the total number of atoms in a formula with parentheses and on how a coefficient changes an atom count
- Multipart scenario (2 questions) with a real-world formula (like 3Ca(NO₃)₂) where students identify each element, count atoms of each, and find the total number of atoms in the formula
A modified version is included for students who need additional support. Fewer multiple-choice distractors and sentence-starter scaffolds on the short-answer items.
If you've taught all five phases, this assessment shouldn't surprise anyone. It's a chance for kids to show you they get it.
How everything fits together
If you want the whole experience (Engage hook, the Station Lab as the Explore, the Explain day with Presentation and interactive notebook, the Student Choice Elaborate, and the Evaluate assessment all in one download), that's the Atoms & Chemical Formulas Complete 5E Science Lesson.
If you only need the one-day hands-on activity, the Station Lab works as a standalone. Most teachers buy the full 5E because the Station Lab works harder when it's bookended by a strong Engage and a follow-up Explain. But both are honest options.
Get the Atoms & Chemical Formulas 5E Lesson
Or if you only need the one-day hands-on Station Lab:
(The Station Lab is included in the full 5E Lesson)
Frequently asked questions
Does this cover all of TEKS 7.6B?
Yes. The full standard is addressed across all five phases, with the periodic table, chemical symbols, subscripts, parentheses, and coefficients all built into the Explore and Explain activities.
What do my students need to know before this lesson?
A basic understanding of atoms, elements, and compounds (TEKS 7.6A). If your kids can describe what an atom is and tell the difference between an element and a compound, they're ready.
How long does it take to teach?
Done with fidelity, about 10 class periods of 45 minutes each: one day for the Engage, two days for the Station Lab, two days for the Presentation and Interactive Notebook, three days for the Student Choice Project, and one to two days for review and the assessment. A compressed sample plan is included in the file if you need to move faster.
Do I need special supplies?
Just colored beads or interlocking blocks for the Station Lab (4+ colors, 30+ pieces per group) and a printed periodic table per group for the Engage. Most teachers already have what they need.
Does this work for digital classrooms?
Yes. Every component has a digital version. The Station Lab is fully digital-ready (Google Slides), the Presentation works in Google Slides, and the Student Choice Projects can be submitted as videos, slide decks, or written work.
Is this 5E lesson aligned to NGSS too?
It aligns with MS-PS1-1 (developing models to describe the atomic composition of simple molecules and extended structures). Built TEKS-first, but the standards overlap.