which of the following correctly identifies the compostition of an oxygen atom

Question

anonymous · Answer

What are the choices?

anonymous · Answer

8 protons 8 neutrons 8 electrons 
6 protons 6 neutrons 6 electrons
8 protons 7 neutrons 6 electrons
6 protons 12 neutrons 6 electrons

anonymous · Answer

It's the first one because the atomic mass for oxygen is 15.9994 (rounded off is 16). In order to get the atomic mass, the protons must be added to the neutrons. Therefore the answer is the first one because 8 protons plus 8 neutrons equal 16, which is the atomic mass. Also, the electrons is the same amount of the protons.

anonymous · Answer

The others would be wrong because they don't add up to 15.9994, or 16.

anonymous · Answer

Is this helpful? :)

anonymous · Answer

yes thank you !|dw:1382412926119:dw|

anonymous · Answer

You're welcome, can I get a metal?...just asking, you don't have to give me one! :)