Chemistry Chapter 7 Test

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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


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