January 2019 1 56 Report
O substanta este alcatuita din trei elemente X , Y, T. Numarul atomic al elementului X este de doua ori mai mare decat numarul atomic al elementului Y. Diferenta dintre numerele atomice ale elementelor X si T este 3 . Elementul T formeaza ioni T- , izoelectronici cu 10Ne.
Determinati numerele atomice ale elementelor
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