EasyChemistryHigh School (9–10)GeneralStructure of the Atom › Subatomic Particles and Atomic ModelsConceptualBoard Exam

The common atom of hydrogen has a mass of 1 u, and it is neutral…

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

The common atom of hydrogen has a mass of $1\ \text{u}$ , and it is neutral.

How many protons, neutrons and electrons does it have?
Why is this atom special among all the atoms?

Need a reminder? The key ideaShow

An atom has three kinds of particle. The proton has a charge of $+1$ and a mass of about $1\ \text{u}$ . The neutron has no charge and a mass of about $1\ \text{u}$ . The electron has a charge of $-1$ and a mass of only $\dfrac{1}{1836}\ \text{u}$ . The charge of one proton is $1.6 \times 10^{-19}\ \text{C}$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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