Atoms and Elements (A2 - B1)
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An atom is the smallest building block of everything that exists. The smallest object you can see under a microscope has more than 10 billion atoms .
There are over a hundred different types of atoms, that we call elements. They form the world we live in.
Well known elements are hydrogen, oxygen, iron or lead. When two elements get together, they form a compound. For example, water has two atoms of hydrogen and one atom of oxygen.
Atoms all have about the same size, but they have different weights. Plutonium is one of the heaviest atoms , about 200 times heavier than hydrogen , which is the lightest element.
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