[reg45]

The question was about atomic “number” of 8, not atomic weight. Atomic number is number of protons. Atomic weight is protons plus neutrons.

[MarkL]

Of course, you're both right... I misquoted the question in my post. Regarding the element with an atomic number of 8, and my thought was carbon, as I clicked on the submit button I remembered the isotope of carbon, C14, with the atomic weight of carbon being 12.

The last time I dealt with chemistry was 1980, so I guess making those mistakes after more than 30 years isn't too bad.

Mark