Name: 
 

Atoms Test



 1. 

Electrons
A.
have a positive charge.
B.
determine the atomic number of an element.
C.
have more mass than the other parts of an atom.
D.
move around outside the nucleus.
 

 2. 

One kind of uranium atom has 92 protons and 143 neutrons. Another atom of uranium has 92 protons and 146 neutrons. The two uranium atoms are different
A.
ions.
B.
elements.
C.
electrons.
D.
isotopes.
 

 3. 

Mg2+ is a magnesium ion that has
A.
two fewer electrons than a neutral magnesium atom.
B.
two fewer neutrons than a neutral magnesium atom.
C.
two more protons than a neutral magnesium atom.
D.
an atomic mass greater than that of a neutral magnesium atom.
 

 4. 

Atoms of an element always have a certain number of
A.
neutrons.
B.
protons.
C.
electrons.
D.
ions.
 

 5. 

The total number of protons and neutrons in the nucleus determines the atom's
A.
symbol.
B.
atomic number.
C.
atomic mass number.
D.
size.
 
 
Use the visual below to answer questions 6 & 7.

nar001-1.jpg
 

 6. 

What is the atom’s atomic number?
A.
4
B.
5
C.
6
D.
9
 

 7. 

What is the atom’s mass number?
A.
4 amu
B.
5 amu
C.
9 amu
D.
13 amu
 

 8. 

How many electrons fill the second energy level?
A.
2
B.
4
C.
6
D.
8
 

 9. 

The central part of the atom is called the
A.
electron.
B.
nucleus.
C.
proton.
D.
neutron.
 

 10. 

Which of the following forces is responsible for holding the nucleus of an atom together?
A.
gravitational
B.
electromagnetic
C.
strong
D.
weak
 



 
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