This article desperately needs help (or removal!). Preceding the article is an appeal to "improve" or expand it (and a request to add references or sources). However, I realize that my first attempt to do this was a bit overreaching.
Nevertheless, the term "mirror isotope" is inaccurate and misleading (as well as scientifically useless), and should be debunked (rather than promoting its use). Furthermore, in modern physics (including the RHIC lecture I attended this evening at BNL), the "mirror" notion is legitimately applied to other situations, such as "broken-mirror" symmetry of certain collisions that produce quark-gluon plasmas (or describing violations of "parity"). This incorrect use of the "mirror" to describe approximately-equal nuclear masses borders upon the mystical!
Furthermore, I argue that it does not violate NPOV for an article about "Mirror Isotope" to make clear that the word "isotope" is wrongly used and to explicitly debunk the incorrect usage. Tripodics (talk) 04:49, 15 October 2010 (UTC)
This article is wrong
A mirror nuclei is one where the number of protons of element one (Z1) equal the number of neutrons of element two (N2) and the number of protons of element two (Z2) equal the number of neutrons in element one (N1). In short, Z1=N2 and Z2=N1.
Formula showing how the masses must be the same.
Z1 = Atomic number of first element Z2 = Atomic number of second element A1 = Atomic mass of first element A2 = Atomic mass of second element N1 = Number of neutrons in first element N2 = Number of neutrons in second element Z1 = A1 - N1 = N2 Z2 = A2 - N2 = N1
N1 = A1 - N2 A2 - N2 = A1 - N2
A2 = A1