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топ дегеніміз тігінен орналасқан элементтердің қатарын топтар деп атайды. Периодтық жүйеде 8 топ бар
Топ дегеніміз қасиеттері ұқсас элементтердің атомдық массасының артуына қарай орналастырылған тік бағаны қатары.