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Question: How do I know if it's a specific ionic bond: if the electronegativity is more than 2 or not? Also, if a molecule is positive or negative...how do you draw it: with brackets on both sides and then negative sign on top right hand side; or a bracket on the right side and a negative sign on the top right hand side?
Answer: To determine if a bond is ionic, you will need to use the periodic trends. You will not be asked to calculate the exact value of a dipole, but will need to understand relative EN of atoms using the trends. Anions (negative charge) are in the brackets. Cations (positive charge) are not. The charge is traditionally written outside the bracket.
A bond is ionic if it has a charge. There is a cation and an anion involved, where the cation loses an electron and becomes positively charged, and the anion gains one and becomes negatively charged. You put brackets and then a superscript to the right.
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