Chemistry Chapter 7 Test
Among Group 1A and 2A, the group number of each element is equal to the number of valence electrons in an atom of that element.
AT
An alloy is a mixture of two or more elements, of which at lest one is a metal
AT
During the formation of ionic compounds electrons are transferred from one atom to another.
AT
During the formation of the compound NaCl, one electron is transferred from a sodium atom to a chlorine atom.
AT
Each metal atom in a body-centered cubic structure has eight neighboring atoms.
AT
In general, atoms react in an attempt to attain the electron configuration of a noble gas.
AT
Ionic compounds conduct electricity better in the molten state that in the solid state.
AT
Metals are ductile because the cation in a piece of pure metal are insulated from one another by a sea of electrons.
AT
Nonmetals typically react by gaining electrons to attain noble gas electron configurations.
AT
The chemical properties of an element are largely determined by the number of valence electrons the element has.
AT
The ionic charge of an element in group 6A is 2-.
AT
When melted, ionic compounds conduct electricity.
AT
Which of the following has a noble gas electron configuration?
Al 3+
Metals typically are
All
A mixture of two or more elements. at least one of which is a metal
Alloy
The chemical formula for the ionic compound formed when elements of Ca and N react is
Ca3Na2
Shows the kinds and numbers of atoms in the smallest representative unit of a substance
Chemical formula
A depiction of the valence electrons as dots around the symbol for an element
Electron dot structure
Ions of the halogen atoms
Halide ions
The attraction of the free-floating valence electrons for positively charged metal ions
Metallic bond
An atom with a positive charge is an anion.
NT
Fluorine and chlorine each have one valence electron.
NT
The atoms of Group 7A elements gain electrons when they form ions.
NT
The chlorine atom gains seven electrons when it becomes an ion.
NT
The coordination number gives the total number of ions in a crystal.
NT
The crystal structure of ionic compounds such as sodium chloride is very unstable
NT
The loss of valence electrons from an atom produces an anion.
NT
The chemical properties of an element are largely determined by its
Number of valence electrons
Among the following element with six valence electrons is
O
Which of the following is an anion
O2+
Atoms in a compound tend to have the electron configuration of a noble gas
Octet rule
Atoms acquire the stable electron structure of a noble gas by losing electrons.
ST
In the formation of an ionic compound, a single electron is transferred from one atom to the other.
ST
Ions have more electrons than the atoms from which they were formed.
ST
Metal atoms are arranged in a face-centered cubic structure.
ST
When a metal atom in a metal crystal has 12 neighbors, the arrangements is a face-centered cube.
ST
What is the number of valence electrons in an atom of Al
3
Atoms of Ca and S would be expected to react in a ratio of
3:1
A piece of metal consists of closely packed cations surrounded by mobile valence electrons.
AT
Alloys are mixtures with at least one metal.
AT
In general ionic compounds
Conduct electricity when they are dissolved in water
The number of ions of opposite charge that surround each ion in a crystal
Coordination number
The nonmetals in Group 5A, 6A, and 7A
Form ions with charges of 3-, 2-, and, 1- respectively
Lowest whole-number ratio of ions in an ionic compound
Formula unit
The forces of attraction that bind oppositely charged ions together
Ionic bonds
Compound composed of cations and anions
Ionic compound
In general, metals react by:
Losing valence electons
All the elements in a particular group of the periodic table have the same number of
Valence electrons
The electron(s) in the highest occupied energy levels of an atom
Valence electrons
