Предмет: Химия, автор: Chifuya

Мотивовано поясніть, чому у третьому періоду періодичної системи 8 елементів, а в четвертому - 18 ?

Ответы

Автор ответа: skrabanastasia44

Ответ:

тому що в напр клад в третьому періоді може бути більше або менше елементів .Із за того ,що там де менше залишають місця для інших які ще не створили.А коли дослідять якийсь ще елемент додають до таблиці Менделєєва

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