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Goodmorning, students! So today we have aninteresting topic to discuss.
Elements are unchangeable! The transformation takes place most easily between 2 elements having one quality in common.
All matter is composed of indivisible particles called atoms. The word atom comes from the greek word "atomos" which mean indivisible.
Atoms are homogeneous, with no internal structure. They are different in their sizes, shapes, and their weight.
Their Science teacher wil be discussing the significant contributions of different people and events on the idea of the atom and the elements to his students.
He started dicussing with one of the most important people concerning The Greeks and atoms, Aristotle.
Compounds are formed by a combination of two or more different kinds of atoms. In a chemical reactions, atoms are neither created nor destroyed, only rearranged.
All atoms of a given element are identical in mass and properties. Atoms cannot be divided into smaller parts.
He now started disussing with the person who came up with the idea of Atom, Democritus.
I studied the passage of an electric current through a gas. As the current passed through the gas, it gave off rays of negatively charged particles.
Atom is a positive sphere with negative electrons dispersed throughout. Atoms are made from a positively charged substance with negatively charged electrons scattered about, like raisins in a pudding.
Then he started dicussing the Alchemists, Greek Science in Alexandria. They changed ordinary metals into precious metals like gold.
He now started discussing the person who developed the atomic theory and said that atoms are still invisible sphere, John Dalton.
Then he discussed J.J Thomson who discovered particles in the atom with negative charge called electrons.
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