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Q1 Week 6 At Theory

Q1 Week 6 Atomic Theory

QuestionAnswer
In Science, matter refers to a substance that has _____ and occupies space. mass
The ______ theory explains that matter is composed of tiny units known as atoms. atomic
Who was the Greek philosopher introduced the idea of atom as the basic building block of matter? He gave them the name atomos. Democritus
______ did not believe in the atomic theory. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. Aristotle
Around 1800, the English chemist John _____ brought back Democritus’ ancient idea of the atom. Dalton
In Dalton's theory he said, atoms are the _____ particles of matter. They cannot be divided into smaller particles. They cannot be created, or destroyed. smallest
Dalton also said in his theory that all atoms of the same element are alike and have the same _______. mass
It wasn’t until _____ that a scientist named Joseph John (J. J.) Thomson discovered that there are smaller particles within the atom. 1897
Thomson called the particles he discovered “_______,” but they were later renamed electrons. corpuscles
Ernest _______ was a student of JJ Thomson. He aimed a beam of alpha particles (radioactive) at a sheet of very thin gold foil. Rutherford
Rutherford called the area of concentrated positive charge that he found in his gold foil experiment the ______. nucleus
Niels Bohr was a student of Rutherford. In 1913, Bohr published a description of a more detailed model of the atom. His model identified more clearly where _____ could be found. electrons
Created by: user-1727869
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