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It is difficult to conceive of the distances between celestial objects. The Earth and the sun are usually around 149,000,000 kilometers apart and the distance between the sun and other stars are so gr ...
Dive into the world of atoms with our interactive learning unit! Explore the fundamental concepts of matter, atoms, and molecules, including atomic structure and the periodic table. By the end, studen ...
Comprendre la composition des atomes et leur classification dans le tableau périodique.
Comprendre le concept d'élément chimique.
Différencier un atome d'une mo ...