WorksheetsRe-Quiz - Isotopes and Average Atomic Mass
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
What does the atomic number tell us? (select all correct answers)
a)
the number of protons
b)
the number of protons and electrons
c)
the number of protons and neutrons
d)
the number of neutrons
2.
Atoms of the same element which have a different number of neutrons are called .
(a)
Choose from the below words
isotopes
ions
quarks
molecules
3.
How many neutrons does C-14 contain? (tap to enlarge the image)
4.
How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)12
5.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
6.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
7.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
8.
An isotope has three forms. 30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu. Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
9.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
10.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
100 %
