Chemistry Figures Particle Diagram
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Particle diagrams of atoms, ions and molecules

Particle Diagram draws the particulate-level pictures used in AP Chemistry: atoms, ions and molecules scattered at random in a box, for a gas, liquid or solution, or packed in a lattice, for a solid. Choose up to four kinds of particle and how many of each. Each atom has a size and a gray shade, an ion carries its charge written in its middle, and a molecule is a center atom with outer atoms touching it, in shapes like Cl₂, H₂O or CCl₄.

Scattered particles always go in the same size box, so four answer choices made one at a time line up on the page. A key beside the box shows each kind with the name you type, and it can go with the box, be left off, or be shown alone, so several answer choices can share one key.

What you can set

  • Layout: scattered in a box, or a lattice of up to 12 rows and 12 columns
  • Up to four kinds of particle, 0 to 60 of each, each alone or joined as a pair, bent, in a line, three around or four around
  • Each atom’s size (XS to XL), shade (white to black) and charge (+, −, 2+, 2−, 3+ or 3−)
  • Lattice patterns: one kind (a pure metal), alternating (an ionic solid), substitutional or interstitial (alloys), touching or spaced
  • A key with your names and a note line, the box’s border (single, double or none), and a chart title

Copying, printing and sharing

Copy the figure straight into a test, worksheet or slide, or download it as a PNG or SVG. Printing the page prints just the figure. Share link copies the page’s address with your settings in it, so anyone who opens it sees this exact figure, and presets save settings you use often in your browser. It’s free, with no sign-up.

Frequently asked questions

What is a particle diagram in chemistry?

A drawing of the atoms, ions or molecules in a sample, showing how many there are and how they are arranged. AP Chemistry uses them to ask students to represent a gas, a solution or a solid, or to pick which picture matches a substance.

How do I make four answer choices that line up?

Make each choice one at a time and copy it into your document. Scattered particles always go in the same square box, so the choices come out the same size. Set the key to Key only to make one shared key for all of them.

Can I show an ionic solid or an alloy?

Yes. Choose Lattice, then Alternating for an ionic solid like NaCl, Substitutional for an alloy like brass, or Interstitial for one like steel, with small atoms in some of the gaps.

Can I put element symbols on the atoms?

No. Atoms are drawn as plain shaded discs, and ions show only their charge. Put names like “Na⁺ ion” or “CCl₄ molecule” in the key instead.

Can a kind of particle appear in the key but not in the box?

Yes. Give it a count of 0 and it is listed in the key only. The key’s note line can say what isn’t drawn, like “H₂O molecules are not shown”.

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