Заряд ядра атома химического элемента, расположенного во 2-м периоде, IIIA группе равен

  1. +7
  2. +5
  3. +2
  4. +8

📝 Detailed explanation

Элемент 2-го периода IIIA-группы — бор B, заряд ядра +5.
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