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Early Atomic Theory

Early Atomic Theories

QuestionAnswer
The concept of the atom goes back more than 2,000 years, to the Greek philosopher [...]. The concept of the atom goes back more than 2,000 years, to the Greek philosopher Democritus.
[...] hypothesized the existence of particles he called atomos, which is Greek for "not-cutable." Democritus hypothesized the existence of particles he called atomos, which is Greek for "not-cutable."
[...]'s experiments showed that matter is neither gained nor lost in a chemical reaction. Lavoisier's experiments showed that matter is neither gained nor lost in a chemical reaction.
In the 1800s, John [...], an English scientist, came up with an atomic theory of matter. In the 1800s, John Dalton, an English scientist, came up with an atomic theory of matter.
Dalton described the relationship between [...] and their atoms. Dalton described the relationship between elements and their atoms.
Thomson proved that [...] charged particles were parts of atoms. Thomson proved that negatively charged particles were parts of atoms.
[...] determined that all atoms have electrons. Thomson determined that all atoms have electrons.
Thomson determined the [...]-to-mass ratio of an electron. Thomson determined the charge-to-mass ratio of an electron.
Thomson's hypothesis that an atom was a swarm of electrons in a mass of positive substance is called the plum pudding model of the atom. Thomson's hypothesis that an atom was a swarm of electrons in a mass of positive substance is called the plum pudding model of the atom.
The mass of an electron was determined by an ingenious '[...] drop' experiment done in 1909 by Robert Millikan. The mass of an electron was determined by an ingenious 'oil drop' experiment done in 1909 by Robert Millikan.
Milikin used Thomson's charge-to-mass ratio of the electron to calculate its [...]. Milikin used Thomson's charge-to-mass ratio of the electron to calculate its mass.
The mass of an electron was determined by an ingenious 'oil drop' experiment done in 1909 by Robert [...]. The mass of an electron was determined by an ingenious 'oil drop' experiment done in 1909 by Robert Millikan.
Created by: mr.shapard