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Cotton's PowerPoint

QuestionAnswer
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
 

 



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