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Sagot :
The symbol or formula:
a) ammonium ion = [NH₄] ⁺
B) chromate ion = [CrO₄] ⁻²
c) tin (II) =Sn ⁺²
d) nitrate ion = [ NO₃] ⁻¹
How to represent the ions?
Ions are atoms or molecules that have a net electric charge due to the loss or gain of electrons. They can be represented by either a dot notation or a Lewis structure. In the dot notation, the number of valence electrons around the atom is indicated with dots located around the symbol representing the element. If the atom has a negative charge, a superscript minus sign is placed next to the element symbol. If the atom has a positive charge, a superscript plus sign is placed next to the symbol. In the Lewis structure, a line is used to represent an electron pair and a pair of dots is used to represent a single electron. The element symbol is placed in the center and the surrounding electrons are drawn in the shape of a circle around it.
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