mastering chem 6A

In an electron-dot structure of an element, the dots are used to represent
In an electron-dot structure of an element, the dots are used to represent

A. the electrons that the element will gain when it forms a compound.

B. only the electrons that will participate in bond formation.

C. the valence electrons.

D. the electron arrangement.

E. all of the electrons in the atom.

The number of valence electrons found in an atom of a Group A element is equal to

A. its atomic number.

B. its group number.

C. its mass number.

D. eight minus the group number.

E. eight.

How many valence electrons does nitrogen have?
How many valence electrons does nitrogen have?
A. one
B. two
C. three
D. four
E. five

The octet rule indicates that

A. atoms lose, gain, or share valence electrons to have 8 valence electrons.

B. all of the shells in an atom hold a maximum of 8 electrons.

C. all of the noble gases have eight total electrons.

D. all of the Group A elements have 8 valence electrons.

E. the noble gases react with other compounds to get 8 valence electrons.

In ionic compounds, __________ lose their valence electrons to form positively charged __________. (5,2)
In ionic compounds, __________ lose their valence electrons to form positively charged __________. (5,2)

A. metals; anions

B. metals; cations

C. nonmetals; cations

D. nonmetals; anions

E. metals; polyatomic ions

What is the ionic charge of an ion with 13 protons and 10 electrons?

A. 2-
B. 2+
C. 3-
D. 1+
E. 3+

The number of electrons in an ion with 20 protons and an ionic charge of 2+ is
The number of electrons in an ion with 20 protons and an ionic charge of 2+ is
A. 16.
B. 24.
C. 20.
D.22.
E. 18.

How many electrons will aluminum gain or lose when it forms an ion?
How many electrons will aluminum gain or lose when it forms an ion?
A. gain 5
B. gain 1
C. lose 2
D. lose 3
E. lose 1

What is the formula of the nitride ion?
What is the formula of the nitride ion?
A. NO33-
B. NO2-
C. NO3-
D. NO32-
E. N3-

What is the correct formula for the oxide ion?
What is the correct formula for the oxide ion?
A. O+
B. O2+
C. O2-
D. O3+
E. O-

An ionic compound
A. contains only anions.
B. has a net positive charge.
C. contains only cations.
D. has a net negative charge.
E. has a net charge of zero.

The correct formula for a compound formed from the elements Al and O is
The correct formula for a compound formed from the elements Al and O is
A. AlO.
B. AlO3 .
C.Al2O3 .
D.Al3O2 .
E. Al2O .

The correct formula for the compound formed from Mg and S is

A. Mg2S2.
B. MgS.
C. Mg2S.
D.MgS2.
E. Mg2S3.

Which one of the following compounds contains an ion with a 3+ charge?
Which one of the following compounds contains an ion with a 3+ charge?
A. FeCl3
B. CuCl
C. Na2O
D. MgCl2
E. KCl

The compound MgCl2 is named
A. dimagnesium chloride.
B. magnesium chlorine.
C. magnesium chloride.
D. magnesium (II) chloride.
E. magnesium dichloride.

Which one of the following elements forms two or more ions with different ionic charges?

A. O
B. K
C. F
D. Fe
E. Ca

What is the correct formula for the iron (II) ion?

A. Fe2+
B. Fe3+
C. Fe2-
D. Fe3-
E. Fe+

What is the correct formula for iron (III) sulfide?

A. Fe2S
B. FeS
C. Fe2S3
D. Fe2S2
E. FeS2

The name of Al2(SO4)3 is

A. aluminum(III) sulfate.
B. dialuminum sulfate.
C. dialuminum trisulfate.
D. aluminum sulfate.
E. dialuminum trisulfide.

Which of the following polyatomic ions has a 3- ionic charge?

A. nitrate
B. hydroxide
C. phosphate
D. bicarbonate
E. sulfate

Fe2(SO4)3 is called

A. iron sulfate.
B. iron (III) sulfate.
C. iron (II) sulfate.
D. diiron trisulfate.
E. iron trisulfate.

What is the formula for aluminum nitrite?

A. Al2NO2
B. AlNO3
C. Al2(NO3)3
D. Al2(NO2)2
E. Al(NO2)3

What is the formula of a compound that contains Na+ and PO43- ions?

A. Na2PO3
B. NaPO4
C. Na3PO4
D. Na3PO3
E. Na3P

The name of the HSO4- ion is

A. hydrogen sulfite.
B. sulfide.
C. sulfate.
D. sulfite.
E. hydrogen sulfate.

Which of the following polyatomic ions has a positive charge?

A. hydrogen carbonate
B. hydroxide
C. sulfate
D. ammonium
E. nitrate

A group of covalently bonded atoms that has an overall electrical charge is called a(n)

A. anion.
B. cation.
C. molecule.
D. polyatomic ion.
E. ionic compound.