Models of four atoms are shown as figures A, B, C, and D. Which two atoms represent isotopes of the same element?

A.
A and C

B.
C and D

C.
B and C

D.
A and B

http://static.k12.com/calms_media/media/939000_939500/939155/1/045694a7dcbbf6c72d19d6c5fbd03a3c622e86d8/MS2_PHY_05_02_109__isotopes.jpg

Question

Models of four atoms are shown as figures A, B, C, and D. Which two atoms represent isotopes of the same element?		
  

 
 A.
A and C
 
 B.
C and D
 
 C.
B and C
 
 D.
A and B

http://static.k12.com/calms_media/media/939000_939500/939155/1/045694a7dcbbf6c72d19d6c5fbd03a3c622e86d8/MS2_PHY_05_02_109__isotopes.jpg

somy · Answer

Isotopes - are atoms of the SAME element which have: 
SAME NUMBER OF PROTONS 
BUT 
DIFFERENT NUMBER OF NEUTRONS 
(electron number = proton number since the talk is most probably about neutral state)

anonymous · Answer

I agree with @Somy

anonymous · Answer

please explain a little simpilar sorry i am not that smart and this is confusing me

anonymous · Answer

C?

anonymous · Answer

@Love_Ranaa

love_ranaa · Answer

Sorry it took so long, but looking at it, I think its B. C & D
Tell me if I'm wrong @TeenWolfGirl

anonymous · Answer

I am confused on this question because i don't get it

somy · Answer

look at red, yellow and blue balls 
note how many each of A, B, C, D have 
then look carefully at numbers 
the 2 of which have same number of BLUE balls-electrons and same number of RED balls-protons  BUT have different number of YELLOW balls-neutrons 
are the isotopes