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WorksheetsAtomic Structure Part 1 (atoms, isotopes, amu)
Total questions: 25
Worksheet time: 50mins
How many neutrons are in the following isotope of lead?
82
125
207
289
What particles form the nucleus of an atom?
protons and neutrons
protons and electrons
neutrons and electrons
electrons only
The name for the negatively-charged subatomic particle that orbits the nucleus of an atom; has 1/1840 mass of a proton.
proton
neutron
cyclotron
electron
Using the periodic table, determine the number of neutrons in ⁶⁵Zn.
35
30
65
90
How many protons, electrons, and neutrons does an atom with an atomic number 50 and a mass number 120 contain?
70 electrons, 50 protons, and 50 neutrons
70 neutrons, 70 protons, and 50 electrons
50 protons, 50 electrons, and 70 neutrons
120 neutrons, 50 protons, and 70 electrons
Based on the mass number and percent abundance for each isotope of an unknown element X shown in the table, what is most likely the identity of the unknown element X?
zinc; average atomic mass = 65.39 u
gallium; average atomic mass = 69.723 u
copper; average atomic mass = 63.546 u
phosphorus; average atomic mass = 30.974 u
The modern periodic table is arranged in order of increasing atomic _____.
radius
charge
number
mass
Which of the following sets of symbols represents isotopes of the same element?
A
B
C
D
A vertical column of elements on the periodic table may also be referred to as a:
group
period
series
formation
A horizontal row of elements on the periodic table may also be referred to as a:
group
period
series
family
More than two thirds (2/3) of the naturally-occurring elements listed on the periodic table are classified as:
metals
metalloids
nonmetals
gases
Which of the following element pictures represents an atom of chlorine?
Element A
Element B
Element C
Element D
Element picture "B" represents which element?
hydrogen
lead
bromine
lithium
What is the mass number of the following isotope of sulfur?
16
34
32
50
Which pair of nuclide symbols are representative isotopes of the same element?
A
B
C
D
Which of the atoms represented by these symbols are isotopes of the same element?
1 and 2
1 and 4
1, 2, 3, 4, and 5
1, 3, and 5
What does the atomic number represent for each element on the periodic table?
number of electrons
number of protons
number of neutrons
number of protons and electrons
What is the average atomic mass of calcium?
20
1.00
40.078 amu
589.8
Hydrogen has three isotopes with mass numbers of 1, 2, and 3 and has an average atomic mass of 1.00794 u. This information indicates that...
more isotopes of hydrogen have an atomic mass of 2 or 3 than of 1.
more isotopes of hydrogen have an atomic mass of 1 than of 2 or 3.
isotopes of hydrogen only have an atomic mass of 1.
equal numbers of each isotope of hydrogen are represented.
The average isotopic mass of chlorine is 35.5 u. Which mixture of isotopes (shown as percents) produces this average mass?
50% C-12 and 50% C-13
75% Cl-35 and 25% Cl-37
75% C-12 and 25% C-13
50% Cl-35 and 50% Cl-37
How many protons, neutrons, and electrons are in the isotope barium-137 ? (ordered respectively)
137, 56, 56
81, 56, 137
56, 81, 56
56, 56, 56
Atoms of the same element that have the same number of protons, but different numbers of neutrons.
cation
anion
isotope
electron
Subatomic particle that has a relative mass of 1 amu, resides in the atomic nucleus, and is neutrally-charged.
isotope
proton
neutron
electron
What information is necessary to determine the average atomic mass of an element on the periodic table?
the atomic mass of each artificially produced isotope of the element
the atomic mass and the relative abundance of each naturally occurring isotope of the element
the relative abundance of each naturally occurring isotope of the element only
the atomic mass of the most abundant isotope only
A 100 gram sample of naturally occurring boron contains 19.78 % of B-10 and 80.22 % of B-11. Which numerical setup can be used to determine the atomic mass of naturally occurring boron?
(0.8022)(10) / (0.1978)(11)
0.1978 + 0.8022
(0.1978)(10) + (0.8022)(11)
(10 + 11) / 2
