I know this is Science but no one is helping me there

Question

anonymous · Answer

One isotope of oxygen has 8 protons and 10 neutrons. Which is the correct reference for this isotope?	
 
 A.
oxygen-18
 
 B.<---------?
oxygen-10
 
 C.
oxygen-8
 
 D.
oxygen-2

anonymous · Answer

hi

anonymous · Answer

i closed it, opps

anonymous · Answer

im stuck, is it C.?

mathslover · Answer

Hello Deadpool117 , no, it is not C.

anonymous · Answer

ok, im confused because when i looked it up it said Oxygen 8

mathslover · Answer

When we write oxygen - X then by "X" we mean, the atomic mass of the element.

We know very well that Atomic Mass = No. of Proton + No. of Neutrons

Here, we have No. of protons = 8 and No. of neutrons = 10 , so, Atomic Mass becomes 18.

mathslover · Answer

Therefore, the isotope is Oxygen - 18

anonymous · Answer

oh thanks you so much

mathslover · Answer

You're welcome Deadpool! :-)