Presentation on theme: "1. How did Bohr’s atomic model improve on previously proposed models? 2. Draw the Bohr model for the ion magnesium would form after satisfying the octet."— Presentation transcript:
1. How did Bohr’s atomic model improve on previously proposed models? 2. Draw the Bohr model for the ion magnesium would form after satisfying the octet rule. 3. What differentiates covalent and ionic bonds? End
Help Astor do big thangs w/ Gen Chem Get that book! Activities Checklist: Finish practice Prepare for stations and exam Evaluate Gen Chem work Finish Reading Finish Naming Practice
Elements combine in various ways to form compounds. Chemists generally divide compounds into two classes: ionic and covalent. Each class has a unique nomenclature system
An ion is an atom that has lost or gained electrons and therefore has a positive or negative charge due to an imbalance of protons and electrons. A polyatomic ion is a group of atoms bonded together as a single unit that carries a net charge.
Tells us everything! Each element in the the same group should share properties with other elements in its group because….
1. The names of elements that are anions are formed by adding –ide to the end of the name Cl - = Chloride ion Br - = Bromide ion O 2- = Oxide ion
2. Polyatomic ions that contain oxygen have names ending in either –ate or –ite -ate ending polyatomic have more oxygens than –ite ones!
2. Sometimes oxygen binds to the same ion with increasing amount of oxygens. These come in 4’s and the pattern is always: Per_____ate = 4 oxygens _______ate = 3 oxygens _______ite = 2 oxygens Hypo______ite = 1 oxygen Example: ClO 4 - = Perchlorate, ClO 3 - = Chlorate, ClO 2 - = Chlorite, ClO - = Hypochlorite
3. Anions created by adding H + to an anions that has oxygen has the prefix of hydrogen or dihydrogen based on the number of H +.
To name ionic compounds, you always name the cation and then the anion.
Acids are named differently than other compounds Two rules when naming acids: 1. Acids containing anions that are only single elements are named by changing the –ide prefix on the anion to –ic and adding hydro in front of the anion. Add acid at the end. ▪ E.g. HCl is hydrochloric acid 2. Acids containing polyatomic ions are named by changing –ate to –ic and –ite to –ous on the anion and then adding acid at the end
The process for naming covalent inorganic compounds requires the following rules: 1. Name the first compound with a Greek prefix to indicate the number of atoms. 2. Name the second compound adding –ide to the end and a Greek prefix to indicate number of atoms. PrefixMeaning Mono-1 Di-2 Tri-3 Tetra-4 Penta-5 Hexa-6 Hepta-7 Octa-8 Nona-9 Deca-10 Greek Prefixes