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The Atom

Total questions: 25

Worksheet time: 15mins

Name
Class
Date
1.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
2.
What is the atomic mass of "F"
a)
9
b)
18
c)
17
d)
19
3.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
4.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
5.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
6.
electrons have this type of charge?
a)
negative
b)
positive
c)
neutral
7.
What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?
a)
22
b)
11
c)
34
d)
23
8.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
9.

What does the atomic number represent?

a)

how many atoms are in a group.

b)

how much an atom weighs.

c)

the number of protons in the nucleus of the atom.

10.

which subatomic particles have no charge (they are neutral)?

a)

protons

b)

neutrons

c)

electrons

11.

What is a subatomic particle with a positive charge?

a)

Proton

b)

Neutron

c)

Electron

12.

How many protons does Potassium (K) have?

a)

19

b)

39

c)

20

d)

58

13.
Which of the following is a substance that can not be broken down into a simpler substance?
a)
Isotope
b)
Element
c)
Compound
d)
Atomic Number
14.
What number indicates an electron?
a)
1
b)
2
c)
3
d)
4
15.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
16.

How many neutrons does this element have?

a)

1

b)

2

c)

3

d)

4

17.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
18.

What is the mass number of a calcium atom that has 21 neutrons?

a)

20

b)

21

c)

41

d)

40

19.

The size of the negative charge of an electron is exactly the same as the size of the positive charge on a proton. What is the overall charge of the helium atom shown in the diagram?

a)

positive

b)

negative

c)

neutral

20.

Electrons have less mass than protons do

a)

true

b)

false

21.

Atoms are made up how many particles

a)

1

b)

2

c)

3

d)

6

22.

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

a)

18 protons

b)

40 protons

c)

22 protons

d)

21.9 protons

23.
If an atom contains exactly three protons, then it's an atom of _____
a)
lithium
b)
gold
c)
nitrogen
d)
carbon
24.
For an atom to be electrically neutral, it must contain the same number of _____
a)
protons and neutrons
b)
neutrons and electrons
c)
protons and electrons
d)
nucleons and electrons
25.
The sum of the number of protons and the number of neutrons is called the _____
a)
atomic number
b)
mass number
c)
isotope number
d)
average weight

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