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WorksheetsIsotopes and Mass Number CFU
Total questions: 20
Worksheet time: 18mins
Name
Class
Date
1.
Two atoms of the same element but with different neutron numbers are called________
a)
electrons
b)
isotopes
c)
variables
d)
electron cloud
2.
Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.
a)
n0 ; atomic #’s
b)
p+ ; atomic #’s
c)
e- ; atomic masses
d)
n0 ; mass numbers
3.
How many neutrons in C-14?
a)
6
b)
7
c)
14
d)
8
4.
Different isotopes have...
a)
different masses
b)
different atomic numbers
c)
different electrons
d)
different protons
5.
How many neutrons does a Sodium - 24 isotope have?
a)
12
b)
13
c)
14
d)
15
6.
How many neutrons does a Carbon - 13 atom have?
a)
6
b)
5
c)
7
d)
8
7.
How many neutrons does a Calcium - 48 isotope have?
a)
16
b)
20
c)
28
d)
12
8.
How many neutrons does an Oxygen-19 isotope have?
a)
19
b)
8
c)
11
d)
10
9.
76 protons and 114 neutrons
a)
Osmium-114
b)
Osmium-76
c)
Osmium-190
d)
Osmium-190.23
10.
12 protons and 13 neutrons
a)
Mg-12
b)
Mg-13
c)
Mg-25
d)
Mg-24.305
11.
9 protons and 9 neutrons
a)
Fluorine-18
b)
Fluorine-9
c)
Fluorine-16
d)
Fluorine-18.998
12.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
13.
What is the atomic number of Neon, Ne?
a)
10
b)
20.1798
c)
10.1798
d)
7
14.
Isotopes of the same element have the same number of
a)
protons
b)
neutrons
c)
electrons
d)
not enough information
15.
The number '14' in the name Carbon-14 represents the ______.
a)
mass number
b)
atomic number
c)
number of protons
d)
number of electrons
16.
How many neutrons does Fluorine-19 contain?
a)
9
b)
19
c)
10
17.
How many protons does Fluorine-19 contain?
a)
9
b)
19
c)
10
18.
How many electrons does a neutral Fluorine-19 atom contain?
a)
9
b)
19
c)
10
19.
What is the atomic number of Fluorine-19?
a)
9
b)
19
c)
10
20.
What is the mass number of Fluorine-19?
a)
9
b)
19
c)
10
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