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WorksheetsYear 9 atomic structure
Total questions: 37
Worksheet time: 30mins
Name
Class
Date
1.
What is the atomic number?
a)
The number of protons in an element
b)
The number of neutrons in an element
c)
The number of protons and neutrons.
d)
The number of protons and electrons.
2.
What is the atomic number of an element with 12 protons, 13 neutrons and 12 electrons?
a)
12
b)
13
c)
25
d)
24
3.
Changing the number of electrons in an atom changes its...
a)
element type.
b)
charge.
c)
isotope type.
d)
atom type.
4.
Changing the number of neutrons in an atom changes its...
a)
element type.
b)
mass (weight).
c)
charge.
d)
atom type.
5.
How many protons are in an atom of carbon?
a)
12.01
b)
8
c)
6
d)
14
6.
How many electrons does a neutral carbon atom have?
a)
0
b)
2
c)
14
d)
6
7.
When there are the same number of protons and electrons in an atom, that atom is a...
a)
positive ion.
b)
negative ion.
c)
unstable isotope.
d)
neutral atom.
8.
Which is an electron?
a)
A
b)
B
c)
C
9.
Which is a proton?
a)
A
b)
B
c)
C
10.
Which is a neutron?
a)
A
b)
B
c)
C
11.
An element can be defined by the number of ___________ in the nucleus of its atoms.
a)
protons
b)
neutrons
c)
electrons
d)
atoms
12.
What parts of the atom make up most of its mass?
a)
protons and electrons
b)
protons and neutrons
c)
neutrons and electrons
d)
electrons
13.
When there are more protons than electrons in an atom it is a...
a)
positive ion.
b)
negative ion.
c)
unstable isotope.
d)
neutral atom.
14.
Lithium-5 isotope (atomic mass=5) has how many neutrons?
a)
5
b)
1
c)
2
d)
3
15.
Which of these would change an atom into a different element?
a)
Change the number of neutrons.
b)
Change the number of protons.
c)
Change the number of electrons.
16.
Who discovered the nucleus of an atom?
a)
JJ Thomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
17.
What are electrons?
a)
Massive, positively charged particles
b)
Tiny, negatively charged particles
c)
Clouds of dust in the nucleus
d)
Neutral particles around the nucleus
18.
Whose model is most similar to the solar system?
a)
Bohr
b)
Thomson
c)
Rutherford
d)
Dalton
19.
What element is represented in this Bohr Model?
a)
Carbon
b)
Hydrogen
c)
Aluminum
d)
Lithium
20.
How many electrons are in the outer most shell of Sodium (Na)?
a)
3
b)
1
c)
2
d)
4
21.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0
22.
How many electrons are in the outer most level of Carbon?
a)
4
b)
8
c)
6
d)
2
23.
How many total electrons does element 15 have?
a)
5
b)
2
c)
8
d)
15
24.
When an element loses an electron, it becomes a
a)
ion
b)
isotope
c)
decay
d)
new element
25.
When an element loses an electron, it becomes?
a)
positive
b)
negative
c)
neutral
d)
a new element
26.
When an atom gains an electron, it becomes-
a)
negative
b)
postive
c)
neutral
d)
a new element
27.
Which of these is an alkali metal?
a)
Na
b)
Mg
c)
Cl
d)
Ar
28.
Which of these has 7 outer most level electrons?
a)
C
b)
N
c)
O
d)
F
29.
How many electrons does potassium K contain?
a)
19
b)
39
c)
20
d)
40
30.
Which following atom has the biggest mass?
a)
Hydrogen
b)
Helium
c)
Boron
d)
Argon
31.
How many electrons would an atom of Krypton have?
a)
83.80
b)
36
c)
12
d)
none
32.
What is the Atomic number of Sulphur?
a)
17
b)
32
c)
16
d)
8
33.
Isotopes of an elements have the same number of ____________ but a different number of __________________..
a)
Neutrons, protons
b)
electrons, protons
c)
protons, electrons
d)
protons, neutrons
34.
How many neutrons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
25
c)
2
d)
18
35.
What scientist is best known for his gold foil experiment?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
36.
When there are the same number of protons and electrons in an atom, that atom is a...
a)
positive ion.
b)
negative ion.
c)
unstable isotope.
d)
neutral atom.
37.
Iron (Fe) has an isotope that has 29 neutrons. What's Iron's mass number?
a)
26
b)
55
c)
56
d)
27
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