[paul cotter (OP)]

I have noticed that threads which involve a discussion that has been raised on another forum get locked. Don't get me wrong on this, I am not disputing forum rules nor do I have a problem with this, I am just curious as to the criteria for this rule.

[Halc]

No hard criteria, just a case-by-case judgement call.
I'd have left it open if the OP was participating, but he has chosen to do all discussion in the other thread, including the deliberate misinterpretation of Bohr's theory, asserting that it is the electron that absorbs the energy, not the atom, because some wiki sentence can be taken to imply that.

I thank all who took the time to provide good answers.