At this time, the end of the sixth millennium and the fifth millennium BC, the first Neolithic cultural groups appear in Egypt. The quantity of archaeological finds does not yet allow us to trace the merging of the Epipaleolithic traditions of the Nile Valley with the cultures of immigrant groups.
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1. 1  Also called negatron. Physics, Chemistry. an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 Ã 10 â19 coulombs, a mass of 9.108 Ã 10 â31 kilograms, and spin of Â½, and existing independently or as the component outside the nucleus of an atom.