
This task is about writing the chemical formulas of ionic compounds.
the numbers above periodic table at each group are the oxidation number of atom in their compounds. Remember, if the atom an element, the oxidation number is zero.
For ionic compounds, the oxidation number is the charge of the cations and anions.
Covalent compounds consist of atoms rather than ions, because there is an electron shared. The oxidation number indicated the number of electron shared (bonded electron pairs, BP). The minus sign indicates that the BP electrons is closely to the atom which has greater electronegativity. This discussing only focuses on the ionic compounds.
1. Write formula of compound between berilium and fluorine.
2. Find 10 (ten) formulas of ionic compounds.
3. Predict which compound from no. (2) has highest boiling point and give the reason.
4. Predict which compound has lowest boiling point and give the reason.
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