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Періодична система

Вибери вірну відповідь

QuestionAnswer
Горизонтальний ряд хімічних елементів період
Вертикальний стовпчик хімічних елементів група
Порядковий номер елемента заряд ядра
Відносна атомна маса нуклонне число
Номер періоду кількість енергетичних рівнів
Номер групи кількість електронів на зовнішньому рівні
Групи поділяються на головні та побічні
Періоди бувають малі та великі
На початку періоду розміщені металічні елементи
В кінці періоду розміщені неметалічні елементи
Created by: 1392825574141087
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