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Cotton's PowerPoint
| Question | Answer |
|---|---|
| What does the term coordination number in an ionic crystal refer to? | the number of ions of opposite charge that surround the ion in a crystal |
| How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration | in order to have at least 8 electrons in the valence shell, the atom must gain 3 electrons |
| How does oxygen obey the octet rule when reacting to form compounds? | in order to have at least 8 electrons in the valence shell, the atom must gain 2 electrons |
| How many valence electrons are in an atom of magnesium? | the atom has 2 electrons in its valence shell |
| What is the electron configuration of the calcium ion? | use you arrow diagram to write the electron configuration |
| Ionic compounds are normally in which physical state at room temperature? | these compounds are usually solids at room temperature |
| What sub-atomic particle is free to drift in metals? | electrons |
| What is the formula of the ion formed when potassium achieves the noble-gas electron configuration? | K^1+ |
| What is the formula of the ion formed when phosphorus achieves a noble-gas configuration? | P^3- |
| know the characteristics of an ionic compound. | crystalline solids, high melting and boiling points, electrolyte (conducts electricity) |
| A compound held together by ionic bonds is called a _____________. | crystal |
| What is the formula for sodium nitride? | Na3N |
| What is the name given to the electrons in the highest occupied energy level of an atom? | valence electrons |
| What is the basis of a metallic bond? | electrons are free to move from one positive ion to another |
| How many electrons are transferred from calcium to iodine when forming the compound calcium iodide? | 2 electrons |
| under what conditions can potassium bromide conduct electricity? | when an ionic compound dissolves in water or is heated to the molten state, the cations and anions are free to move and conduct electricity |
| What is the electron configuration of the oxide ion (O^2-) | use the arrow chart---remember that the oxygen has gained 2 additional electrons |
| An ionic bond is a bond between _______________. | anions and cations |
| How many electrons does silver need to lose in order to achieve a pseudo-noble-gas? | 1 electron |
| Which of the following ions has a pseudo-noble-gas configuratioj: Fe^2+ or Cu^2+ | |
| Which metallic crystal structure has a coordination nyumber of 8? | cesium chloride----the positive ion is surrounded by 8 negative ions |
| What is the name of the compound formed from lithium and bromine? | lithium bromide |
| How many valence electrons are in an atom of phosphorus? | 5 valence electrons |
| In a hexagonal close-packed crystaql, every atom (except those on the surface) has _________ neighbors. | 6 ions |
| What is the electron configuration of the gallium ion? | use the arrow diagram to write the configuration |
| What characteristic of metals makes them good electrical conductors? | each positive ion is surrounded by a "sea" of free moving electrons |
| The electron configuration of a fluoride ion (F^1-) is ___________________ | use the arrow diagram to write the configuration remembering that fluorine has an additional electron |
| Which of the following pairs of elements is most likely to form and ionic compound: magnesium and fluorine or sodium and aluminum? | magnesium is a metal and, as such, will give electrons away. fluorine is a nonmetal and, as such, will take electrons |
| How does an ionic bond form? | forms by the transfer of electrons from one atom (metal) to another atom (nonmetal) |
| What is true about the melting temperature of potassium chloride? | being an ionic compound, the melting point will be very high |
| How many electrons are transferred from potassium to nitrogen in the formation of the compound potassium nitride? | nitrogen requires 3 electrons to have a total of 8 valence electrons. each potassium atom will transfer one electron. a total of 3 potassium atom and one nitrogen atoms will be involved in the formation of a formula unit of potassium nitride |
| How many valence electrons are in a silicon atom? | 4 electrons |
| What is the formula for potassium sulfide? | K2S |
| How many electrons does barium have to give up to achieve a noble-gas electron configuration? | 2 electrons |
| How many valence electrons are in rubidium? | 2 electrons |
| What is the net charge of the ionic compound calcium fluoride? | zero |
| how does calcium obey the octet rule when reacting to form compounds? | by giving away 2 electrons, the calcium ion formed will have 8 valence electrons |
| the octet rule states that, in chemical compounds, atoms tend to have _________. | full valence level or at least 8 electrons |
| How many valence electrons are in bromine? | 7 electrons |
Created by:
johnwhitfield35125