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- 1. Multiple Choice
What do we call the tiny core at the center of an atom, containing most of the atom’s mass and all of its
electron
neutron
proton
nucleus
- 2. Multiple Choice
The "building blocks" of matter are:
electrons
atoms and molecules
found only in the plasma state.
as of yet undiscovered.
- 3. Multiple Choice
Atoms with the same atomic number but different atomic mass are called:
prototypes
subtypes
isotopes
ions
- 4. Multiple Choice
What is the fundamental property of matter that can either be positive or negative?
charge
mass
magnetism
gravity
- 5. Multiple Choice
Compared to protons, electrons have:
much smaller mass and opposite charge.
about the same mass and opposite charge.
much larger mass and the same charge.
much larger mass and opposite charge.
- 6. Multiple Choice
The ____ is one kind of particle that makes up the atom and carries a positive charge.
electron
proton
neutron
plasma
- 7. Multiple Choice
Atomic number is:
the number of electrons and protons in an atom.
the number of neutrons and protons in an atom.
the number of electrons in an atom.
the number of protons in an atom.
- 8. Multiple Choice
A particle with zero charge found in the nucleus of an atom is called a(n):
electron
proton
neutron
positron
- 9. Multiple Choice
The mass of an electron is about:
1800 times heavier than a proton.
1800 times lighter than a proton.
10,000 times heavier than a proton.
10,000 times lighter than a proton.
- 10. Multiple Choice
The mass of an atom is determined mainly by the:
mass of the neutrons.
mass of the neutrons and protons.
mass of the electrons.
mass of the electrons and neutrons.
- 11. Multiple Choice
A common isotope of Carbon has an atomic number of 6 and a mass number of 13. How many neutrons are in
an atom of this isotope?
6
7
12
13
- 12. Multiple Choice
A charged particle that accounts for nearly half the mass of an atom is the:
electron
neutron
proton
positron
- 13. Multiple Choice
Atoms of the same element may contain:
the same number of neutrons but a different number of protons.
the same number of protons but a different number of neutrons.
a different number of protons and a different number of neutrons.
the same number of electrons but a different number of protons.
- 14. Multiple Choice
Scientists have broken down protons and neutrons into smaller particles called _____.
isotopes
nuclei
quarks
electrons
- 15. Multiple Choice
Which of the following atomic particles is electrically neutral?
electron
nucleus
neutron
proton
- 16. Multiple Choice
Which atomic model is represented by tiny, solid particle in the figure?
Dalton model
Rutherford model
Democritus model
Bohr model
Thomson model
- 17. Multiple Choice
_______ are atoms of the same element that have different numbers of neutrons.
compounds
ions
alpha particles
isotopes
- 18. Multiple Choice
The atomic number of Re is 75. The atomic mass of one of its isotopes is 186. How many neutrons are in an atom of this isotope?
186
75
261
111
- 19. Multiple Choice
The element hydrogen has three naturally occurring isotopes. Which of the following describes the relationship of these isotopes?
same mass, different atomic number
same mass, same atomic number
different mass, same atomic number
different mass, different atomic number
- 20. Multiple Choice
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is
52
56
26
30
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