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cabrerafreddy780
25.07.2020 •
Chemistry
Al reaccionar sodio (Na) con 3,2g de oxígeno (O2) se forman 12,4 g de oxido de sodio (Na2O) ¿Qué masa de sodio reaccionó? (Escriba y equilibre la ecuación.)
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Ответ:
1s^2 2s^2
Explanation:
Beryllium is the fourth element with a total of 4 electrons. The electron configuration for beryllium is the first two electrons that will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital. Therefore the Be electron configuration will be 1s^2 2s^2.