Introduction To Atoms: Question Preview (ID: 18707)

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The scientist that discovered electrons
a) Democritus b) Dalton c) Thomson d) Rutherford
The scientist that used a gold-foil experiment to learn about atoms
a) Dalton b) Thomson c) Rutherford d) Aristotle
Lead has an atomic number of 82. How many protons does it contain?
a) 164 b) 41 c) 82 d)
The force in an atom that keep protons in the nucleus
a) weak b) strong c) electromagnetic d) gravitational
The force in an atom that is important in radioactive atoms
a) weak b) strong c) electromagnetic d) gravitational
You can identify each isotope of an element by
a) its mass number b) its atomic number c) its neutrons d) its electrons
An atom becomes a positively charged ion when it
a) loses a proton b) loses an electron c) loses a neutron d)
This represents the current atomic theory
a) plum-pudding model b) chocolate- sundae model c) electron-cloud model d)
Protons and neutrons are made up of smaller particles called
a) nebula b) novas c) quarks d)
Democritus's ideas of atoms were not accepted because of this man
a) Rutherford b) Bohr c) Galelio d) Aristotle
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