Let’s go step by step to understand what each term means and how they’re different.
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Step 1: What is an ELEMENT?
An element is a pure substance made of only ONE kind of atom. You can’t break it down into anything simpler by chemical means.
Example: Carbon (C), Gold (Au), Helium (He).
In the table, it shows carbon as an example — that’s one type of atom, so it’s an element.
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Step 2: What is an ATOM?
An atom is the smallest piece of an element that still keeps all the properties of that element. Think of it like a single Lego brick — you can’t break it further without losing what makes it “Lego.”
Atoms have parts inside them: protons, neutrons, and electrons. But for now, just remember:
one circle = one atom.
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Step 3: What is a MOLECULE?
A molecule is when two or more atoms are stuck together (bonded) chemically. It’s the smallest unit of a compound that can take part in a reaction.
Example: Water (H₂O) — that’s 2 hydrogen atoms + 1 oxygen atom bonded together. That whole group is one molecule.
Even O₂ (oxygen gas) is a molecule — two oxygen atoms bonded together.
Note: Not all molecules are compounds! If a molecule has only one type of atom (like O₂), it’s not a compound. Compounds must have at least two DIFFERENT types of atoms.
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Step 4: What about COMPOUNDS and MIXTURES? (They’re not in the table but mentioned in the aim)
- A
compound is a substance made of two or more DIFFERENT elements chemically bonded together. Example: H₂O (water), CO₂ (carbon dioxide).
- A
mixture is when two or more substances are mixed together but NOT chemically bonded. They can be separated easily. Example: salt water, air.
But since the table only asks about Element, Atom, and Molecule — we’ll focus on those.
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Now let’s check if everything matches:
✔ Element → One kind of atom → Can’t be broken down → Symbol: C, He, etc.
✔ Atom → Basic building block → Shown as one circle → Has nucleus with protons/neutrons + electrons
✔ Molecule → Group of atoms bonded → Smallest unit that reacts → Shown as grouped circles → Like H₂O or O₂
All definitions and drawings match correctly.
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Final Answer:
The table correctly defines and illustrates:
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Element: A substance made of only one type of atom (e.g., Carbon).
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Atom: The basic unit of matter; one circle represents one atom.
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Molecule: Two or more atoms bonded together (e.g., water = H₂O); shown as grouped circles.
Compounds and mixtures were mentioned in the question title but not included in the table — compounds are molecules made of different elements, and mixtures are physical combinations not chemically bonded.
Parent Tip: Review the logic above to help your child master the concept of molecules and compounds worksheet.
