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chapter 7 chemistry test (11/16/18)
Terms in this set (38)
T/F: The chlorine atom gains seven electrons when it becomes an ion
T/F: The chemical properties of an element are largely determined by the number of valence electrons the element has
T/F: An atom of an element in Group 1A has seven valence electrons
T/F: Among Group 1A and 2A elements, the group number of each element is equal to the number of valence electrons in an atom of that element
T/F: Sulfur and magnesium both have two valence electrons
Describe the formation of an ion from a nonmetal in terms of the octet rule.
Nonmetals attain stable noble gas configurations by gaining electrons and forming anions with 8 electrons in the outermost energy level
Describe the formation of an ion from a metal in terms of the octet rule.
Metals attain noble gas structure by losing electrons and forming cations with a complete octet in what is now the outermost energy level
T/F: In forming an ionic compound, an atom of an element gains electrons.
T/F: Ionic compounds cannot conduct electricity if they are dissolved in water
characteristics of an ionic bond
bind oppositely charged ions together and positive charges of cation = negative charges of anion
When ionic compounds are melted, the orderly crystal structure _______ _______
To find the number of valence electrons in an atom of a representative element, simply look at its ________ __________
you can never have more than __ electrons in the outer shell
Atoms of metals tend to ______ their valence electrons, leaving a complete octet in the next-lowest energy level.
Atoms of some nonmetals tend to _______ electrons or share electrons with another nonmetal atom or atoms to achieve a complete octet.
a positively charged ion produced when an atom loses one or more valence electrons
a negatively charged ion produced when an atom gains one or more valence electrons
ions produced when atoms of chlorine and other halogens gain electrons
Ionic compounds are electrically
most ionic compounds are crystalline solids at
have high melting points
ionic compounds can conduct an ____________ _____________ when melted or dissolved in water
these bonds hold metal together
properties of metals
good conductors of electric current
the most important alloys today are
what is the meaning of coordination number?
it's the number of ions of opposite charge that surround an ion in a crystal
how is the coordination number determined?
x-ray diffraction - patterns firm positions
what is a metallic bond?
The attraction of free floating valence electrons to the positive metal cation
how is the electrical conductivity of a metal explained by metallic bonds?
The sea of electrons are able to move around and carry an electric current
are metals crystalline? explain
Yes - cations are arranged in a compact, orderly, repeating crystal structure
3 possible crystalline arrangements of metals
what is an alloy?
mixture of elements with metallic properties
name the principle elements present in each of the following alloys- brass
copper & zinc
name the principle elements present in each of the following alloys- bronze
copper & tin
name the principle elements present in each of the following alloys- stainless steel
iron, chromium, carbon, nickel
name the principle elements present in each of the following alloys- sterling silver
silver & copper
name the principle elements present in each of the following alloys- cast iron
iron & carbon
name the principle elements present in each of the following alloys- spring steel
iron, chromium, carbon
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