Particles Atoms and Compounds and Molecules, Oh My!

ParticlesAtoms and Compounds and Molecules, Oh

One Element (A)

The Same Element (B)(Solid)

This one likes to go round in pairs as a

gas (molecules)

Another element (B)

A mixture of two elements (A and

Compare it to the mixture of two

different elements you drew before

This is a COMPOUND of two different

elements (A and B) (not a mixture!)

Element, Compound or

Mixture ?

Element

Mixture ?

Element

Mixture ?

Mixture

Mixture ?

Mixture

Mixture ?

Compound

Mixture ?

Compound

Mixture ?

A mixture of a compound and

an element

What do we call these things?

An Atom

3 Atoms

6 Atoms which happen to be of 3 different elements

A Molecule

Yes, it also happens to be 2 atoms joined

together but we don’t call it “2 atoms joined together” we say it is

one molecule

A Molecule of a compound

2 molecules of a compound

A compound has a definite ratio

of atoms, e.g. H2O is

2 HydrogensTo 1 Oxygen,

always

What about when all the atoms are

stuck together like in a solid element?

This is just a load of atoms in a solid

element, it is not a big molecule

Finally, just to confuse you even more, science teachers like talking

ParticlesParticle is just a fancy name for

individual things. These individual things could be atoms, molecules,

lumps of soil, grains of sand, bits of metal. It doesn’t matter because

particle is just a general word which is used when we don’t (or can’t) want to

be exact about the type of things being described.

A good example of when science teachers use the word particle is

when talking about air.

Air is a mixture of elements such as oxygen, argon and nitrogen mixed with compounds such as

carbon dioxide

Some of the elements in air go around as single atoms (such as

argon).

Or as molecules such as oxygen.

Compounds go around as molecules.

That’s why we talk about particles because it saves the bother of describing exactly what sort of

things they are.

Particles Atoms and Compounds and Molecules, Oh My!

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