WorksheetsCounting Subatomics & Isotopes
Total questions: 25
Worksheet time: 14mins
Name
Class
Date
1.
How many protons are in lead?
a)
207
b)
82
c)
298
d)
125
2.
How many neutrons are in sodium?
a)
23
b)
11
c)
34
d)
12
3.
How many electrons are in barium?
a)
56
b)
137
c)
193
d)
81
4.
What does the atomic mass stand for?
a)
number of protons
b)
number of electrons
c)
number of neutrons
d)
number of protons and neutrons
5.
What does the atomic number stand for?
a)
number of protons
b)
number of neutrons
c)
number of electrons
d)
number of protons and neutrons
6.
If you know the atomic number of an element, what other two values do you know?
a)
the number of protons, the number of neutrons
b)
the number of protons, the number of electrons
c)
the atomic mass, the number of protons
d)
the number of neutrons, the number of electrons
7.
How many protons are in cobalt?
a)
27
b)
59
c)
32
d)
86
8.
What is the atomic number for nickel?
a)
59
b)
28
c)
31
d)
87
9.
How many neutrons are in chlorine?
a)
52
b)
35
c)
17
d)
18
10.
What is the atomic mass of osmium?
a)
76
b)
190
c)
266
d)
114
11.
How do you calculate the number of neutrons in an atom?
a)
It's the same as the number of protons.
b)
It's the same as the number of electrons.
c)
It's the same as adding the number of protons and neutrons.
d)
Round the mass, and subtract the atomic number.
12.
If an atom contains 55 electrons, how many protons will it have?
a)
55
b)
133
c)
30
d)
25
13.
Which element has atomic number 24?
a)
chromium
b)
magnesium
c)
vanadium
d)
manganese
14.
What is the name of this element?
a)
Lisbon
b)
Librarium
c)
Lithium
d)
Lithuania
15.
What is the name of this element?
a)
Cool
b)
Creepy
c)
Car
d)
Carbon
16.
How many neutrons are in potassium?
a)
20
b)
39
c)
19
d)
58
17.
What is different between these two atoms of oxygen?
a)
They have a different number of protons.
b)
They have a different number of neutrons.
c)
They have a different number of electrons.
d)
They don't have anything different.
18.
Using the diagram, what is a good definition of an isotope?
a)
Isotopes are atoms that have different amounts of electrons.
b)
Isotopes are atoms that have different amounts of protons.
c)
Isotopes are atoms that have different amounts of neutrons.
d)
Isotopes are atoms that have a different atomic number.
19.
How many electrons does neon have?
a)
20
b)
10
c)
30
d)
5
20.
How is the periodic table organized?
a)
by number of neutrons
b)
by number of electrons
c)
by atomic mass
d)
by atomic number
21.
Why are normal atoms neutral?
a)
The number of protons and electrons are the same.
b)
The number of protons and neutrons is the same.
c)
The number of electrons and neutrons is the same.
22.
What is the symbol for beryllium?
a)
be
b)
BE
c)
Be
d)
bE
23.
What is the symbol for zinc?
a)
Zn
b)
Z
c)
Zi
d)
Zc
24.
What is the symbol for mercury?
a)
Me
b)
Mr
c)
Hg
d)
My
25.
How many electrons are in iridium?
a)
77
b)
192
c)
115
d)
269
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