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02 Atomic theory Flashcards | StudBud
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02 Atomic theory
02 Atomic theory
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1
Who conducted experiments with cathode rays?
James Chadwick
Niels Bohr
J. J. Thomson
Erwin Schrodinger
2
Who is credited with discovering electrons?
James Chadwick
Ernest Rutherford
John Dalton
J. J. Thomson
3
Which scientific finding(s) resulted from the oil drop experiment?
The size and mass of an electron was determined.
The discovery of the neutron
The discovery of the electron.
The size and mass of a proton was determined.
4
Which scientist explained electrons have discrete energy levels?
John Dalton
Ernest Rutherford
James Chadwick
Niels Bohr
5
Who first coined the term "atom" or "atomos"?
Ernest Rutherford
J. J. Thomson
John Dalton
Democritus
6
Which subatomic particle is the smallest in size and mass?
proton
neutron
electron
7
What is NOT a scientific finding that resulted from the gold foil experiment?
The nucleus is positively charged.
The atom has a small, dense nucleus.
Electrons are negatively charged.
The atom is mostly empty space.
8
Who determined the exact size and mass of an electron?
James Chadwick
Robert Millikan
Erwin Schrodinger
Ernest Rutherford
9
5 protons, 2 electrons, and 6 neutrons: What is the atomic number?
5
6
11
2
10
What did J. J. Thomson call his model of the atom?
The planetary model
The electron model
The plum pudding model
The chocolate chip model
11
Who discovered the neutron?
Werner Heisenberg
Democritus
James Chadwick
Neils Bohr
12
If an atom has 7 protons and 10 electrons, what is its ionic charge?
3+
10-
3-
7+
13
If an atom has 4 protons and 2 electrons, what is its ionic charge?
2+
2-
2-
4+
14
If an atom has 3 protons and 4 neutrons, what is its atomic number?
7
4
3
1
15
Which statement of Dalton's atomic theory is NOT true today?
All atoms of a given element are identical in mass and properties.
A chemical reaction is a rearrangement of atoms.
All matter is made of atoms.
Compounds are combinations of 2 or more different types of atoms.
16
5 protons, 2 electrons, and 6 neutrons: What is the mass number?
5
6
11
2
17
Who conducted the gold foil experiment?
Ernest Rutherford
Democritus
Robert Millikan
John Dalton
18
If an atom has 3 protons and 4 neutrons, what is its mass number?
1
3
7
4
19
Which subatomic particles make up the nucleus of the atom?
electrons and neutrons
protons and neutrons
protons and electrons
neutrons only
20
Which subatomic particle was discovered most recently?
electron
proton
neutron
