Element X is a neutral element and has 39 protons. What element is it and how many electrons does it have? (Use the periodic table)
A.
Argon – 18
B.
Yttrium – 39
C.
Platinum – 78
D.
There is not enough information to determine.
Points Possible:2.00
2.
Using the periodic table, which of the following is an isotope?
A.
C – 12
B.
Zn – 68
C.
Tb – 159
D.
Cs - 133
Points Possible:2.00
3.
Cerium has 58 neutrons and 58 protons.
A.
True
B.
False

Question

Element X is a neutral element and has 39 protons.  What element is it and how many electrons does it have? (Use the periodic table)
 A.	
Argon – 18
 B.	
Yttrium – 39
 C.	
Platinum – 78
 D.	
There is not enough information to determine.
Points Possible:2.00
2.  
Using the periodic table, which of the following is an isotope? 
 A.	
C – 12
 B.	
Zn – 68
 C.	
Tb – 159
 D.	
Cs - 133
Points Possible:2.00
3.  
Cerium has 58 neutrons and 58 protons. 
 A.	
True
 B.	
False

anonymous · Answer

I think i have an idea

praxer · Answer

1. It is Yttrium as it has a atomic number ( no. of protons) = 39

2.  Zn 68 is a non radioactive isotope of Zinc.

3. True as the atomic number is 58( no. of protons). To maintain electrical neutrality no. of electron = no. of proton.

ipwnbunnies · Answer

I answered you in Physics...I wrote out a nice explanation and you left me for dead.