В ядре элемента 42 нейтрона; протоны составляют 44% от числа нуклонов. Определите элемент.

  1. As
  2. Ge
  3. Br
  4. Se

📝 Detailed explanation

p = a, A = a + 42, p/A = 0,44 → a = 0,44(a+42) → 0,56a = 18,48 → a = 33 (As).
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