QUESTION IMAGE
Question
how many elements were in the periods for the first two rows of mendeleevs table? eight ten twelve seven
Brief Explanations
En la tabla periódica de Mendeleev, la primera fila (período 1) tiene 2 elementos y la segunda fila (período 2) tiene 8 elementos. Sumando 2 + 8 = 10 elementos en los dos primeros períodos.
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B. ten