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Atomic Structure
Atomic Structure
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Chemistry Atomic Structure
Flashcards
15 cards
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Practice quiz
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Questions
15
Answers
1
What physicist discovered the electron using a cathode ray?
Dalton
J.J. Thomson
Democritus
Rutherford
2
True or false: Most of the mass of an atom is concentrated in its nucleus
True
False
3
True or false: Mass number - atomic number = number of neutrons in an atom
True
False
4
Who did the gold foil experiment?
Millikan
Rutherford
Dalton
Chadwick
5
Since atoms are electrically neutral, the number of ______ must equal the number of ______
Protons, electrons
None of the above
Protons, neutrons
Neutrons, electrons
6
Atoms that have the same number of protons but different numbers of neutrons are...
Monomers
Isotopes
Ions
Polymers
7
Who transformed Democritus's ideas on atoms to a scientific theory using experimental methods?
J.J. Thomson
Rutherford
Millikan
Dalton
8
Who proposed the atom is mostly empty space?
Dalton
Democritus
Rutherford
Millikan
9
If the atomic number of Nitrogen is 7, what is Nitrogen's mass number?
13
14
7
6
10
What physicist confirmed the existence of the neutron?
Millikan
Rutherford
Chadwick
Dalton
11
What is the nucleus of an atom composed of?
Protons only
Protons and neutrons
Neutrons only
Protons and electrons
12
Which subatomic particle occupies almost all of the volume of the atom?
Electrons
Neutrons
The nucleus
Protons
13
The total number of protons and neutrons in an atom is called the...
Mass number
Proton number
Atomic number
Chemical number
14
The number of protons in the nucleus of an atom is the...
Mass number
Chemical number
Atomic number
Proton number
15
True or false: each electron has a mass about 1840 times that of a proton
False
True
