Compare Elements and Compounds Activity: 8 Hands-On Stations for Teaching Atoms, Molecules, Chemical Symbols, and Formulas (TEKS 7.6A)

Chris Kesler · 8 min read

Write H2O on the board and ask a 7th grader what it means. Most of them know it's water. Ask them what the H stands for. Hydrogen, usually. Ask what the little 2 means. Now you'll get the deer-in-headlights look. Ask whether water is an element or a compound, and the room gets really quiet.

This is the gap. Kids hear chemical formulas every day. Soda has CO2. Salt is NaCl. Their toothpaste has fluoride (F). They've memorized a few of these like song lyrics, but they don't know what the symbols and subscripts actually mean. They don't know why NaCl is fundamentally different from Na. And they really don't know why O2 is a molecule but not a compound, even though it has more than one atom.

The Compare Elements and Compounds Station Lab for TEKS 7.6A closes that gap in one to two class periods. Kids build six gumdrop models with toothpicks (one for each element color), translate chemical formulas into 3D structures, and sort cards into element vs. compound piles. By the end, they can look at a formula like CH4 and tell you exactly what it's made of and why it's a compound, not an element.

⏱ 1–2 class periods 📓 7th Grade Science 🧪 TEKS 7.6A 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching elements and compounds

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check the gumdrop models, and break misconceptions while kids work through the rotation.

The Compare Elements and Compounds Station Lab has four input stations (where students take in new info on atoms, molecules, compounds, chemical symbols, and chemical formulas) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn elements and compounds

🎬 Watch It! —

A short YouTube video introduces atoms, molecules, and compounds. Students answer three questions: which one cannot be broken down further (atoms, molecules, or compounds) and why, what makes one element different from another, and what makes a compound different from an element. Visual learners come alive at this station before they ever touch a gumdrop.

📖 Read It! —

A one-page passage called "Atoms Make Up Everything" opens with the joke about not trusting atoms ("they make up everything") and walks students through atoms, elements, chemical symbols (Na, O), molecules, compounds, and chemical formulas (H2O, with the subscript explained). Three multiple-choice questions follow, plus five vocabulary words to define. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Students build gumdrop models with toothpicks. Six colors stand for six elements: Red = oxygen, White = hydrogen, Green = nitrogen, Purple = carbon, Orange = sodium, Yellow = chlorine. They build models for CO2, O2, N2, NaCl, and Cl2, then label each one as an element, molecule, or compound. The moment a kid builds CO2 (one purple, two red) and sees that it's two different atoms stuck together, the definition of "compound" snaps into place. By the end, they've built five molecules with their hands.

💻 Research It! —

Students examine 14 reference cards: a full periodic table, individual element cards for carbon (C, 12.011), oxygen (O, 15.999), and hydrogen (H, 1.0079), a 3D model of methane (CH4), molecule diagrams, and definitions of elements, molecules, compounds, chemical symbols, and chemical formulas. Eight questions follow, including "Why would oxygen gas (O2) be a molecule, but not a chemical compound?" That's the question that catches the kids who think anything with two atoms is automatically a compound.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A card sort. Kids sort 12 chemical formulas into Elements (Na, Mg, He, B, Fe, F) versus everything else with multiple atoms (NaCl, CH4, LiHCO3, O2, MgO, H2O). The kid who memorized that "compounds have more than one atom" gets caught when they have to think about whether O2 is in the same pile as NaCl. Easy to spot-check at a glance.

🎨 Illustrate It! —

Students draw an element side by side with a compound, then write a short description of what makes each one different. Even kids who say "I can't draw" surprise themselves here. The drawings lock in the visual difference between one type of atom and two or more different types bonded together.

✍️ Write It! —

Three open-ended questions: compare and contrast an element and a compound, explain what differentiates a chemical formula from a chemical symbol, and classify Ne, Cl2, and NO2 as atom, molecule, or compound with evidence. The third question is the killer. Cl2 trips kids who think any formula with two atoms must be a compound, and Ne trips kids who don't realize a single atom symbol is still an element.

📝 Assess It! —

Three multiple-choice questions plus a fill-in-the-paragraph that uses all five Read It! vocabulary words (atoms, chemical symbols, molecules, compound, chemical formula). The paragraph reads like a quick story about water: "___ are the tiny building blocks... we use ___ to abbreviate the names of elements... when two atoms bond, they create ___..." If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: make flashcards for at least 10 vocabulary terms, write an acrostic poem using the word ELEMENT, draw a 4-panel comic strip of a chemical reaction (using all the Read It! vocab), or build a 5-page flipbook on chemical formulas and reactions. Requires teacher approval before they start.

How this fits into a complete elements and compounds unit

This Station Lab is the Explore day of our full Compare Elements and Compounds Complete 5E Lesson for TEKS 7.6A. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Compare Elements and Compounds Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on elements vs. compounds, the Station Lab on its own does the job.

Two options

Compare Elements and Compounds 5E Lesson cover

Full 5E Lesson $13.20 Get the 5E Lesson

Compare Elements and Compounds Station Lab cover

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach compare elements and compounds

Materials beyond what's in the download:

Gumdrops in 6 colors (red, white, green, purple, orange, yellow). About 30 total per group rotation. Each color stands for one element.
Toothpicks for the bonds. A small box covers a class.
Index cards for the Challenge It! flashcards extension.
Colored pencils or markers for the Illustrate It! station.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station

Standard covered: Texas TEKS 7.6A —

Compare elements and compounds, including atoms, molecules, chemical symbols, and chemical formulas. Supporting Standard.

See the full standard breakdown →

Grade level: 7th grade physical science

Time: One to two class periods (45–110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"Anything with more than one atom is a compound."
This is the misconception that trips the most 7th graders. They see O2 or N2 and think "two atoms = compound." The Read It! passage gives the rule: a compound is two or more different atoms bonded together. A molecule is two or more atoms (same or different) bonded. The Explore It! station hits this directly when kids build O2 with two red gumdrops and have to label it as a molecule, not a compound. The Write It! question ("is Cl2 an atom, molecule, or compound?") catches the stragglers.
"Chemical symbols and chemical formulas are the same thing."
Kids use the words interchangeably. Na, NaCl, H2O all look like "chemistry stuff" to them. The Research It! cards split the two concepts apart: a chemical symbol stands for one element (one capital letter, sometimes a lowercase). A chemical formula uses one or more symbols plus subscripts to describe a molecule or compound. The Assess It! questions force the distinction with two side-by-side questions: "Which is a chemical symbol?" (Na) and "Which is a chemical formula?" (H2O).
"Salt is just one ingredient, so it must be an element."
Kids treat "one item in the kitchen" as "one element on the periodic table." Salt looks like one substance, so it must be an element, right? The Explore It! gumdrop model breaks this. They build NaCl with one orange gumdrop (sodium) and one yellow gumdrop (chlorine) joined by a toothpick. Two different elements bonded = compound. The Organize It! card sort then forces them to put NaCl in the compound pile and Na in the element pile, side by side, so the difference becomes obvious.

What you get with this compare elements and compounds activity

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels — for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (periodic table, element cards for carbon/oxygen/hydrogen, methane molecule, plus the definitions)
Sort cards for the Organize It! station (12 chemical formulas to sort into elements vs. compounds)
Student answer sheets for each level

No login required. Download once, use forever. Reprint as many times as you want.

Tips for teaching elements and compounds in your 7th grade classroom

Two things make this lab go smoother the first time:

1. Sort the gumdrops by color into 6 cups before class.

If kids have to dig through a mixed bag to find one purple gumdrop, you lose 5 minutes per group at the Explore It! station. Six small cups, one per color, with a sticky-note label on each ("PURPLE = CARBON"). Drop them in a basket at the station and the building goes fast.

2. Catch the O2-vs-NaCl moment in real time.

When you walk past the Explore It! station, ask the group what they wrote down for O2. If they wrote "compound," walk them back to the Read It! definition. The same misconception will show up at Organize It! and Write It! — if you fix it at Explore It!, you save grading time later.

Get this compare elements and compounds activity

Compare Elements and Compounds Station Lab for 7th grade physical science — TEKS 7.6A

Buy the Station Lab — $7.20

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson — $13.20

(Station Lab is included)

Frequently asked questions

What does TEKS 7.6A cover?

Texas TEKS 7.6A asks 7th grade students to compare elements and compounds, including atoms, molecules, chemical symbols, and chemical formulas. By the end, students should be able to look at a formula like NaCl or H2O and explain that it's a compound made of two or more different elements, and tell the difference between a chemical symbol (one element) and a chemical formula (a molecule or compound).

What's the difference between a molecule and a compound?

A molecule is two or more atoms bonded together. The atoms can be the same (like O2 or N2) or different. A compound is more specific: it's two or more different atoms bonded together (like H2O or NaCl). Every compound is a molecule, but not every molecule is a compound. This is the single most useful definition to drill into 7th graders, and the gumdrop models in the Explore It! station make it stick.

How long does this elements and compounds activity take?

One to two class periods (45 to 110 minutes total). The Explore It! gumdrop building is the longest part, so plan for two periods the first time you run a station lab. Once your class has the routine down, most groups can finish all 8 stations in one period.

Do I need to provide my own materials?

Gumdrops in 6 colors, toothpicks, index cards, and colored pencils. Total cost for a class of 30: under $15 if you don't already have these supplies. Walmart or your grocery store has gumdrops in the candy aisle. The Watch It! station also needs a device with internet.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. The hands-on gumdrop modeling can be replaced by drag-and-drop atom models in the digital version, or you can keep the Explore It! station as the one physical center kids rotate through.