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Unit 3 - The Atom

Total questions: 45

Worksheet time: 37mins

Name
Class
Date
1.

What is the name of a single type of atom?

a)

cell

b)

proton

c)

element

d)

atom

2.

What is the term for combining 2 or more atoms together?

a)

atoms

b)

elements

c)

molecules

d)

compounds

3.

What is the term for combining 2 or more DIFFERENT atoms together?

a)

atoms

b)

elements

c)

molecules

d)

compounds

4.

What is the picture showing?

a)
atom
b)
element
c)
molecule
d)
compound
5.

What is the picture showing?

a)
atom
b)
element
c)
molecule
d)
compound
6.

Where are protons found in the atom?

a)

in the center (nucleus)

b)

in the rings around the center

c)

There are no protons in the atom

7.

According to Dalton's atomic theory, all matter is made of ________.

a)

Molecules

b)

Protons, neutrons, and electrons

c)

Atoms

d)

Subatomic particles

8.

Dalton proposed that all atoms of a given element are ________ in mass and properties.

a)

Different

b)

Similar

c)

Identical

d)

Varied

9.

According to Dalton's atomic theory, a chemical reaction is ________.

a)

The creation of new atoms

b)

The destruction of atoms

c)

The rearrangement of atoms

d)

The conversion of atoms into energy

10.

All matter is composed of extremely small particles called _______

a)

osmosis

b)

compounds

c)

atoms

d)

molecules

11.

In a chemical reactions atoms are _____,____, and _____

a)

combined

b)

rearranged

c)

seperated

d)

destroyed

12.

How many neutron are in the "naturally occurring" atom "K" as found on the periodic table?

a)

29

b)

19

c)

58

d)

20

13.

The atomic number o a neutral element is equal to _.

a)
the number of protons and electrons
b)
the number of neutrons only
c)
the total number of protons and neutrons
d)
the number of protons neutrons and electrons
14.
Adding or subtracting neutrons (charge = 0, mass = 1) makes the element change into an...
a)
ion
b)
mixture
c)
isotope
d)
neutral atom
15.
The atomic mass is equal to _.
a)
the number of protons only
b)
the number of neutrons only
c)
the total number of protons and neutrons
d)
the number of protons, neutrons, and electrons.
16.
An atom becomes _________ when it gains electrons.
a)
Positive
b)
Negative
c)
Neutral
d)
Invinsible
17.
An atom that has gained or lost electrons is called ...
a)
a winner
b)
an isotope
c)
an ion
d)
a loser
18.

When an atom loses an electron, it becomes a

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

19.

Neutrons have the same mass [1 amu] as which subatomic particle?

a)

Electrons

b)

Protons

20.

To have a charge of zero, what two particles must be balanced in an atom?

a)

Protons and Electrons

b)

Protons and neutrons

c)

Electrons and neutrons

21.

What subatomic particle is different between isotopes?

a)

Electrons

b)

Protons

c)

Neutrons

22.

Mass number is a measure of an atom's

a)

Electrons and protons

b)

Electrons and neutrons

c)

Neutrons and protons

23.

Different elements can have the same number of protons?

a)
True
b)
False
24.
What does the 6 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
25.
What does 12.011 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
26.

the basic structural unit of matter

a)

atom

b)

matter

c)

element

d)

nucleus

27.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
28.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
29.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

30.
A fluorine atom has 9 protons and 10 neutrons. What is the atomic number of fluorine?
a)
9
b)
10
c)
19
d)
1
31.
A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?
a)
15
b)
16
c)
31
d)
1
32.

What is the number of protons in Magnesium atom ?

a)

12

b)

24

c)

23

d)

8

33.

What is the mass number for this Magnesium atom?

a)

12

b)

24

c)

23

d)

8

34.

What do these isotopes of neutral carbon all have in common?

a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
35.
How many neutrons in C-14?
a)
6
b)
7
c)
14
d)
8
36.

What is formed when an atom loses electrons and becomes positively charged?

a)

A molecule

b)

A neutron

c)

An ion

d)

A compound

37.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
38.

In an atom, there are three types of subatomic particles. ______ are positively charged, ______ are negatively charged, and ______ are neutral.

a)

Protons, Electrons, Neutrons

b)

Electrons, Protons, Neutrons

c)

Neutrons, Protons, Electrons

d)

Electrons, Neutrons, Protons

39.

An atom of an element with a different number of neutrons and therefore a different atomic mass

a)

Isotope

b)

Ion

c)

Atom

d)

Particle

40.

Isotopes are atoms of the same element with different ____________.

a)

Number of Neutrons & Mass Number

b)

Number of Protons & Atomic Number

c)

Number of Protons, Neutrons, and Electrons

d)

Number of Electrons & Mass Number

41.

What is the ATOMIC MASS of the isotope Carbon-14?

a)

14

b)

6

c)

12

d)

20

42.

Neutral Carbon-14 has ____ protons, ____ electrons, and _____ neutrons.

a)

6, 6, 8

b)

6, 6, 6

c)

6, 6, 14

d)

6, 10, 14

43.

An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?

a)

15

b)

16

c)

31

d)

46

44.

9 protons and 9 neutrons

a)

Fluorine-18

b)

Fluorine-9

c)

Fluorine-16

d)

Fluorine-18.998

45.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

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