đốt cháy hoàn toàn 2,34g hỗn hợp gồm metyl axeta, etyl fomat và vinyl axetat rồi hấp thụ toàn bộ sản phẩm cháy vào dd Ca(OH)2 dư. sau thu được 10g kết tủa và dd X. khối lượng X so với khối lượng dd Ca(OH)2 ban đầu thay đổi như thế nào

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.