Classify atoms, molecules, elements, and compounds worksheet ... - Free Printable

Let me analyze each particle diagram to classify them correctly.

First, I'll examine each diagram one by one:

1) This shows several identical molecules made of black, red, and white spheres bonded together. All particles are the same type of molecule → compound (molecular)

2) This shows yellow spheres arranged in a regular, repeating pattern with fixed positions → solid element (atomic solid)

3) This shows red spheres scattered randomly with space between them, not bonded → gas element (atomic gas)

4) This shows pairs of green and yellow spheres bonded together; all pairs are identical → compound (diatomic molecular)

5) This shows a linear molecule: white–red–red–white, all atoms bonded in one unit → compound (molecular)

6) A single blue sphere alone → element (atomic, could be solid/liquid/gas, but simplest is atom of an element)

7) Multiple identical molecules, each with one blue and three white spheres → compound (molecular), like NH₃

8) Red and yellow spheres in a tightly packed, ordered 3D lattice → solid mixture? Wait—actually, two types of atoms in fixed ratio and pattern → likely a compound in solid state (ionic or molecular crystal)
But looking more carefully: alternating red and yellow in layers — this looks like an ionic compound crystal lattice (e.g., NaCl-type), so compound (ionic solid)

However, classification typically uses these categories:
- Element (atomic): single type of atom, not bonded (e.g., noble gases) or in lattice (e.g., metals, atomic solids)
- Element (molecular): diatomic/polyatomic molecules of same element (e.g., O₂, S₈)
- Compound (molecular): molecules with ≥2 elements covalently bonded
- Compound (ionic): ions in lattice (no discrete molecules)
- Mixture: more than one substance present

Let me re-evaluate each with standard classification used in such worksheets:

1) All particles are identical molecules with 3 types of atoms → compound
2) Uniform atoms in fixed lattice → element (solid)
3) Separate atoms, far apart, random motion → element (gas)
4) Identical diatomic molecules of two different atoms → compound
5) One molecule: 4 atoms (2 white, 2 red), bonded → compound
6) One atom → element
7) Identical molecules (1 blue + 3 white) → compound
8) Ordered lattice of two atom types alternating → compound (ionic solid)

In many school worksheets, they classify as:
- Pure element (atomic or molecular)
- Pure compound (molecular or ionic)
- Mixture

None here show mixtures (i.e., two or more substances physically mixed). All diagrams show only one type of particle or one type of molecule/unit.

So final classification per number:

1) Compound
2) Element
3) Element
4) Compound
5) Compound
6) Element
7) Compound
8) Compound

But we need to specify *type* if asked — the instruction says “Classify accordingly”, and typical expected answer is:
- Element
- Compound
- Mixture

Since no mixture appears, all are either element or compound.

Let me double-check for mixtures:
- Diagram 1: only one kind of molecule → compound
- Diagram 2: only yellow atoms → element
- Diagram 3: only red atoms → element
- Diagram 4: only green-yellow pairs (same molecule) → compound
- Diagram 5: only one type of molecule → compound
- Diagram 6: one atom → element
- Diagram 7: only one type of molecule → compound
- Diagram 8: only one type of repeating unit (alternating red/yellow) → compound (ionic)

Yes — no mixtures.

So the classifications are:
1) Compound
2) Element
3) Element
4) Compound
5) Compound
6) Element
7) Compound
8) Compound

Now, since the user didn’t ask for explanation (ExplainAnswer: false), I only provide the final answer in the required format.

Final Answer:
1) Compound
2) Element
3) Element
4) Compound
5) Compound
6) Element
7) Compound
8) Compound