Flashcards
Atom unit flashcards
Cards in this deck (23)
- 1are atoms the smallest particles of matter?yes
- 2Are atoms divisible?No
- 3What is the mass of a neutron?1 amu
- 4What is the mass of an electron?1/2000 amu
- 5What is the mass of a neutron?1 amu
- 6What is a negatively charged ion called?An anion
- 7What is a positively charged ion?A cation
- 8What did Earnest Rutherford discover?Through the gold foil model, Earnest Rutherford discovered that all the positive charge in an atom was concentrated in its nucleus, and the rest of the atom is empty space. Electrons are arranged randomly around the nucleus.
- 9What was the order of scientists and models?Democritus "atomos," 1808-1806 JOhn Dalton Billiard's Ball Model, 1906 J.J. Thompson Plum Pudding Model, 1901-1911 RUtherford Gold Foil model, 1913 Neils Bohr Electron Shell THeory, 1920s Schroedinger Electron Orbitals, 1932 Chadwick the Neutron.
- 10What were the details of Democritus' discoveries?- All matter is composed of atoms that are too small to be seen.
- There is no void (empty space)
-Atoms are completely solid with no internal structure
-atoms differ in size shape, and weight depending on substance.
Atoms are indivisible - 11What was wrong with Democritus' model?There is a void, atoms have internal structure, and they do not vary in weight.
- 12What was John Dalton's discovery and what were the details?John Dalton (1806-1808) discovered the Billiard's Ball Model.
-Each element is composed of the same atom.
-Atoms of the same substance have atoms of the same size, mass, and shape.
-Atoms form compounds in ratios of 1:1, 1:2, 2:1 etc.
-Chemical reactions are rearrangements of atoms.
-Atoms have no internal structure. - 13What has been proven wrong about both Dalton's and Democritus' models?Atoms have internal structures and do not vary in shape.
- 14What was J.J. Thompson's discovery and what were the details?Plum pudding model, 1906-1908
- Atoms are divisible.
-discovered the electron
-Contains both positive and negative charge material.
-Positive and negative forces balance each other out.
-Atom is neutral, 0 charge
-Discovered electron
-Electrons are suspended randomly in positive material. - 15What did Thompson prove wrong about Dalton and Democritus's modelAtoms have an internal structure composed of positive material and electrons,
and atoms are divisible. - 16What was earnest Rutherford's discovery and what were the details?1901-1911 Earnest Rutherford used the Gold Foil model to discover...
-Nucleus and protons
-Nucleus contains most of the mass and is positively charged.
-Atom is mostly empty space, and electrons move around in it. - 17What did Rutherford prove wrong about Thomson's model?-All the positive energy is gathered in the nucleus, not throughout the atom.
-Ther is empty space in the atom, which is where the electrons are suspended. - 18What was Niels Bohr's discovery and what were the details?1913, electron shell theory and model.
-the area in which the electrons are orbiting the nucleus is called the electron shell or orbit.
-Each shell can only hold a certain number of electrons.
-ONce the shell is filled the next outer shell begins to fill. - 19How did Bohr's discovery advance Rutherford's?It clarified where the electrons were placed, while Rutherford assumed that they were arranged randomly around the nucleus.
- 20How many electrons are in each shell of the Electron Shell Model?1=2
2=8
3=8
4=16
5=16
6=32
7=32 - 21What was Schroedinger's discovery and what were the details?Schroedinger (1920's) Discovered the wave model...
-Electrons are in orbit, ut don't rotate around the nucleus like planets around the sun. Instead, they are in orbitals.
-Electrons can change orbits.
-Must give off energy to move to a lower level, and vice versa.
-if energy is higher then energy levels are higher.
-orbitals-energy levels
-Give off/absorb electromagnetic radiation as a photon. - 22How did Schroedinger's discovery advance Niels Bohr's?Schroedinger advanced his theory by being more specific about how electrons orbit the nucleus
- 23What was Chadwick's discovery and what were its details?In 1932 Chadwick discovered the Neutron.
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- Flashcards on Atom unit flashcards, created by Daphne Gil on 18/01/2023.
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- Daphne Gil · Jan 2023
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- Jan 18, 2023
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