Mendeleev placed the ____ in order of their weight. He then considered their ____ and swapped the order of some elements so that those with ____ properties were placed in the same ____. He also left gaps for elements that had not yet been ____.

Periodic Table - Mendeleev

طباعة
تضمين

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

استعادة الحفظ التلقائي: ؟