Flashcards
Chemistry Revision
Cards in this deck (14)
- 1How did J. J. Thomson contribute to the discovery of the atom?Proposed 'Plum Pudding Model'- Positive atom with negative electrons embedded in it.
- 2How did Ernest Rutherford contribute to the discovery of the atom?He did the 'Gold Foil Experiment'. Hans Geiger and Ernest Marsden fired positive alpha particles at gold foil. Most of these passed through but a few of the particles reflected back at different angles. This proved that atoms have a small, circular, positive nucleus in the middle and are mostly empty space.
- 3How did Niels Bohr contribute to the discovery of the atom as we know it?He used mathematical ideas to improve Rutherford's model and showed that electrons occupy shells.
- 4How do scientists spread their ideas?By talking to each other at vig meetings, publishing papers in scientific journals and magazines and online.
- 5Why do scientists try to spread their work?So that other scientists can check their work to make sure it is correct, and so they can announce that they made the discovery first.
- 6What does the group of an element tell you about it?The number of electrons on the outermost shell.
- 7What does the period of an element tell you about it?The number of shells.
- 8What does the atomic number of an element tell you about it?The number of protons it has and how many electrons it has, if it's an atom.
- 9What does the relative atomic mass of an element tell you about it?The number of protons + nuetrons it has.
- 10What order do the scientists that contributed to the discovery of the atom go in?John Dalton- 1803
J. J. Thomson- 1897
Ernset Rutherford- 1909
Niels Bohr- 1913 - 11What is the atomic number, relative atomic mass, number of electrons, protons and neutrons?atomic number = 13
relative atomic mass = 27
neutrons = 27 - 13 = 14
protons = atomic number = 13
electrons = protons = 13 - 12What is the electron configuration of potassium? group = 1 period = 4 atomic number = 192.8.8.1
- 13What is the difference between a chemical and physical change?A chemical change is irreversible whereas a physical change is reversible.
- 14—
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- Flashcards on Chemistry Revision, created by Stasio Okon-Rocha on 16/05/2019.
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- Stasio Okon-Rocha
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