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The atom and its properties Flashcards | StudBud
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The atom and its properties
The atom and its properties
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Properties of atoms.
Flashcards
22 cards
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Questions
22
Answers
1
Except for hydrogen, atoms are composed of
we don't know
electrons
protons, neutrons, and electrons
protons
2
The calculated mass of an atom, usually expressed as atomic mass units is the....
mass number
atomic mass unit
atomic mass
3
Uranium has an atomic number of 92. An isotope of uranium has 143 neutrons. This isotope is called ....
Uranium 235 (92 + 143)
Uranium 143
Uranium 92
4
Which subatomic particle basically has no mass?
the proton
All particles have the same mass.
the electron
the neutron
5
What are the charges of subatomic particles?
All particles have the same charge.
Protons are positive, neutrons are negative, electrons are neutral.
protons are positive, electrons are negative, neutrons have no charge
Protons and neutrons are positive, electrons are negative.
6
A mass equal to one-twelfth the mass of an atom of carbon-12 is the....
atomic mass unit
mass number
average atomic mass
7
All atoms of an element have the same number of protons but may have different numbers of
megatrons
neutrons
electrons
planets
8
The number of energy levels of an atom is determined by....
the number of electrons.
the number of neutrons
the atomic mass
9
Carbon's atomic number is 6 and has 6 neutrons called carbon 12. An isotope of carbon with 7 neutrons is called
Carbon 6
We can't figure this out.
carbon 13
carbon 12 too
10
Rutherford is credited with discovering the __________ of an atom.
mass
existance
nucleus
electron
11
The nucleus of an atom has a positive charge.
False
True
12
Modern atomic theory describes electrons as _________on a string.
protons
planets
waves
butterflies
13
Electrons are found
outside the nucleus with the protons.
outside the nucleus in a "cloud".
inside the nucleus with the protons.
Inside the nucleus.
14
The atomic number for cadmium is 48. That means an atom of cadmium has
A total of 48 protons and electrons.
48 neutrons
48 protons
An atomic mass number of 48.
15
Protons and neutrons are found in the nucleus of the atom.
False
True
16
The mass number of an element's atoms is the number of
neutrons and electrons.
protons and electrons.
marshmallows in a bag.
protons and neutrons.
17
All matter is composed of
marshmallows
atoms
stuff
molecules
18
Rare isotopes have less impact on the average atomic mass than commonly found isotopes.
True
False
19
Aluminum's atomic number is 13. The mass number is 27. How many neutrons does an atom of aluminum have?
Can't be calculated with this information.
14
13
50
20
The modern atomic theory says the _______ of an electron can't be known.
energy
location.
mass
charge
21
Rutherford's experiment determined that the positive charge of an atom is located....
by electrons
in the nucleus
around the nucleus
22
The atomic number of an element's atoms is the number of neutrons.
False
True
