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WorksheetsFriday - Atoms & Elements
Total questions: 50
Worksheet time: 57mins
Name
Class
Date
1.
An atom is ___________.
a)
the smallest particle of an element
b)
the smallest particle that still can be considered an element
c)
the building blocks of matter
d)
building blocks
2.
Bohr's model of the atom consisted of a central ___________ surrounded by electrons moving in specific __________.
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3.
How is the cloud model of the atom different from Bohr's model?
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4.
An electron has a charge of _____.
a)
1
b)
-1
5.
A proton has a charge of ______.
a)
1
b)
-1
6.
What is the definition of an atomic number? How do we distinguish one element from another?
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7.
The modern atomic model can be described as ______________.
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8.
As scientists collected experimental evidence, atomic theories and models changed over time.
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9.
What three particles are found in an atom?
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10.
Which two particles are found in an atom's nucleus?
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11.
Explain why scientists use models to study atoms.
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12.
Which two particles in an atom are equal in number?
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13.
How are elements identified in terms of their atoms?
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14.
What two particles account for almost all of the mass of an atom?
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15.
The _________ is the very small, dense center of an atom.
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16.
The positively charged particle of an atom is called a(n) __________.
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17.
A particle with no charge is a(n) _____________.
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18.
A(n) _________ is the particle of an atom that moves rapidly in the cloud-like region around the nucleus.
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19.
The __________ tells the number of protons in the nucleus of every atom of an element.
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20.
Atoms of the same element that have the same number of protons but different numbers of neutrons are called ___________.
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21.
The sum of protons and neutrons in the nucleus of an atom is the _____________.
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22.
Scientists will often use a(n) _________, an object that helps explain ideas about the natural world.
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23.
The positively charged particle in an atom's nucleus is the
a)
electron
b)
neutron
c)
proton
d)
isotope
24.
An element's identity can be determined from its
a)
atomic number
b)
number of neutrons
c)
number of isotopes
d)
energy levels
25.
The smallest particle an element can be divided into is the
a)
electron
b)
neutron
c)
isotope
d)
atom
26.
The model of the atom that described electrons that scattered throughout a ball of positive charge was proposed by
a)
Niels Bohr
b)
Ernest Rutherford
c)
J.J. Thomson
d)
John Dalton
27.
An element's mass number tells the number of protons in its nucleus.
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28.
Negatively charged particles in an atom are called electrons.
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29.
The cloud model of the atom describes the location of electrons as specific orbits around the nucleus.
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30.
Atoms with the same number of protons but different numbers of neutrons are called isomers.
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31.
The sum of the protons and neutrons in an atom is called the atomic number.
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32.
An object that helps explain ideas about the natural world is called a model.
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33.
The rows in the periodic table are called
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34.
The columns in the periodic table are called
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35.
What do elements in the same group in the periodic table have in common?
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36.
A(n) _____ is an abbreviation for the name of an element and usually has either one or two letters
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37.
Mendeleev arranged his periodic table in order of increasing atomic number.
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38.
The rows in the periodic table are called periods.
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39.
Moving across the periodic table from the left to right, one finds, in order, metals, then gases, then nonmetals.
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40.
Another name for a period is a family.
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41.
On the periodic table, elements in the same column have similar properties.
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42.
An element's ______ can be predicted from its location on the periodic table.
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43.
The average mass of all the isotopes of an element is called the ______.
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44.
The modern periodic table is arranged in order of increasing _______.
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45.
Information found on the periodic table for each element includes its atomic number, _______, name, and atomic mass.
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46.
An element with atomic number 10 is located to the ______ of an element with atomic number 9.
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47.
The diagram below is a square from the periodic table. What is the atomic number?
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48.
The diagram below is a square from the periodic table. What is the chemical symbol?
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49.
The diagram below is a square from the periodic table. What is the name?
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50.
The diagram below is a square from the periodic table. What is the atomic mass?
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