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Let's begin by looking at something that you might have collected:

 * subatomic particles - In [|physics] or [|chemistry], **subatomic particles** are the smaller particles composing [|nucleons] and [|atoms]. There are two types of subatomic particles: [|elementary particles], which are not made of other particles, and [|composite particles]. [|Particle physics] and [|nuclear physics] study these particles and how they [|interact].[|[1]]


 * atom - The **atom** is a basic unit of [|matter] that consists of a dense, central [|nucleus] surrounded by a [|cloud] of [|negatively charged] [|electrons].


 * proton - The **proton** is a [|subatomic particle] with an [|electric charge] of +1 [|elementary charge]. One or more protons are present in the [|nucleus] of each [|atom], along with [|neutrons].


 * neutron - The **neutron** is a [|subatomic particle] with no net [|electric charge] and a [|mass] slightly larger than that of a [|proton].


 * nucleus - The **nucleus** is the very dense region consisting of [|nucleons] ([|protons] and [|neutrons]) at the center of an [|atom]. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus, with a very small contribution from the [|orbiting electrons]. It was discovered in 1911, as a result of [|Ernest Rutherford]'s interpretation of the famous 1909 [|Rutherford experiment] performed by [|Hans Geiger] and [|Ernest Marsden], under the direction of Rutherford.


 * electron - The **electron** is a [|subatomic particle] carrying a negative [|electric charge]. It has no known components or substructure. Therefore, the electron is generally believed to be an [|elementary particle].[|[2]] An electron has a [|mass] that is approximately [|1/1836] that of the [|proton].[|[9]]

Now you have to organize those terms and ideas into a well written explaination, here is an example.
The atom is the basic building block of all matter. It is composed of three different types of subatomic particles, protons, neutrons and electrons, and broken into two distinct regions, the nucleus and the electron cloud. Each of these subatomic particles and regions is unique and have their own characteristics.

You can add more to this by expanding on the last statement in the example.