WorksheetsAtoms Molecules Compounds
Total questions: 25
Worksheet time: 25mins
Name
Class
Date
1.
All matter is made of
a)
energy
b)
atoms
c)
air
d)
chemistry
2.
The positive particles of an atom are
a)
electrons
b)
atoms
c)
neutrons
d)
protons
3.
The central region of an atom where its neutrons and protons are is called the
a)
nucleus
b)
electron cloud
c)
core
d)
center
4.
Neutrons are
a)
negative
b)
positive
c)
neutral
d)
cows
5.
Electrons are
a)
negative and in the nucleus
b)
positive and at the edge of the atom
c)
not in an atom
d)
negative and at the edge of the atom
6.
Most of the atom is filled with
a)
electrons
b)
empty space
c)
the nucleus
d)
protons
7.
Which of the following is NOT matter
a)
air
b)
heat
c)
steam
d)
cow
8.
Element is a
a)
pure substance
b)
compound
c)
mixture
d)
molecule
9.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
10.
which one only has one type of atom In it.
a)
Element
b)
compound
11.
Is salt (NaCI) a compound or a element
a)
Compound
b)
element
12.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
13.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
14.
What is the atomic mass (rounded to the nearest whole number) of this element
a)
196
b)
196.95
c)
197
d)
79
15.
How many protons does an Aluminum atom have? (use the picture to help you)
a)
27
b)
13
c)
14
d)
40
16.
How many neutrons does a sodium atom have?
a)
23
b)
11
c)
12
d)
34
17.
Carbon dioxide is a compound.
a)
True
b)
False
18.
What is the atomic mass of Neon?
a)
10
b)
20.18
c)
10.18
d)
22.18
19.
What characteristic of an element's atoms ALWAYS determines the element's identity?
a)
the number of neutrons
b)
the number of protons
c)
the atomic mass
d)
the number of valence electrons
20.
which one only has one type of atom In it.
a)
Element
b)
compound
21.
Hydrogen is a compound.
a)
True
b)
False
22.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
None of these
23.
How many electrons does potassium K contain? (click to see image)
a)
19
b)
39
c)
20
d)
40
24.
How many electrons does an Iodine atom have?
a)
53
b)
126
c)
73
d)
179
25.
Atoms have neutrons and ________ in the nucleus.
a)
protons
b)
electrons
c)
shells
d)
ions
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