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Atom is tiny, hard, and uncuttable. The shapes of atom explain behaviors of elements. Atoms of water are round ball. Atoms of fire have sharp edges.
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Timeline
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Solid, indivisible sphere. Could not destroy or reconstruct.
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Atom is a sphere of positive charge containing a few negatively charged particles, called electrons, distributed in the sphere like raisins as a plum pudding.
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Divisible units composed of positive charges concentrated in the nucleus with negative charges orbiting around the nucleus.
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Electrons in atoms are restricted to contain circular orbit around the nucleus. Similar to the planets orbit around the sun.
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A probability to find electrons within a space surrounding the nucleus. The cloud is denser where the probability of finding the electron is high. The cloud is less dense where the probability of finding the electron is low.
