It is neither a wave nor a particle; it is a photon. There are measurements that give "wave-like" results; when performing one of these, the photon has all the properties of a wave. There are other experiments that give "particle-like" resluts; when performing of these other expemints, the photon has all the prpoerties of a particle.
Photon is a photon is a photon. (If you prefer Rand to Stein, delete the first two words of the previous sentence.) Wave and particle are our descriptions of experimental results, not descriptions of photons.
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