musenkoalina musenkoalina

04-05-2024
Chemistry

Answered

Номер періода вказує на: А) Заряд ядра. Б) Кількість електронів на зовнішньому енергетичному рівні. В) Кількість енергетичних рівнів. Г) Загальне число електронів в атомі.

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