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26 Cards in this Set

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In his gold foil experiement, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because
-most of the particles passed straight through the foil
-some particles were slightly deflected
-a few particles bounced back
True of False?
The ATOMIC NUMBER of an element is the number of protons and neutrons in the nucleus.
False

Mass Number
True of False

All atoms of the same element contain the same number of NEUTRONS
False

Protons
True of False
The MASS NUMBER is an average of the masses of all naturally occurring isotopes of an element
False

Atomic Mass
True of False?

PROTONS have no electrial charge
False

Neutrons
protons
the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number, which determines the identy of an element.
The discovery of which particle proved that the atom is not indivisble?
Electon
how many protons does an atom with an atomoic number of 23 and a mass number of 51 have?
23
True of False
The MASS NUMBER is an average of the masses of all naturally occurring isotopes of an element
False

Atomic Mass
An atom has no overall charge if it contains equal number of
electons and protons
True of False
Protons are part of the nucleus of an atom
TRUE
True of False

Neutorns have a mass of 1 amu
True
What determines the idently of an element?
atomic number
mass number
atomic mass
overall charge
atomic number
nucleus
the particles of the nucleus that have no charge
model
a representaion of an object of system
Atom
the smallest particle into which an element can be divided and stll retain all of the properites of that elelment.
electrons
the negatievely charged particles found in all atom; electrons are involved in the formation of chemical bonds
theory
a unifying explanation for a broad range of hypotheses and observiations that have been suported by testing.
electron clouds
the regions inside an atom where electrons are likely to be found
neutrons
the particles of the nucleus that have no charge
atomic mass unit (amu)
the SI unit usedto express the masses of particles in atoms
isotopes
atoms that have the same number of protons but have different number of neutrons
atomic number
the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
True of False?

Electons are found in the NUCLEUS of an atom
False

Electon Cloud
mass number
the sum of the protons and neutrons in an atom
atomic mass
the weighted average of the masses of all the naturally occurring isotopes of an element