The valence is in the upper right corner of the element, and+and-should also be used to indicate whether it is positive ion or negative ion; Ionic electron type: write the element symbol first, and the surrounding small black dots should achieve a stable structure. It is best to mark the positive and negative signs in brackets in the upper right corner (with anions, without cations).
Related information:
Complex cations (such as NH4+, H3O+, etc. ) The equivalence of * * * electron pair and non-* * electron should be marked with brackets, and the charge of ions should be marked at the upper right of brackets.
The concept of ionic bond is a chemical bond formed by electrostatic interaction between anions and cations. Compounds bound by ionic bonds are called ionic compounds. The electronegativity of ionic compounds is marked by putting together anions and cations that make up ions. The formula of writing rules: more outside and less inside, smaller outside and bigger inside, alternating yin and yang.