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.
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?
A. one
B. two
C. three
D. four
E. five
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)
A. metals; anions
B. metals; cations
C. nonmetals; cations
D. nonmetals; anions
E. metals; polyatomic ions
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
A. 16.
B. 24.
C. 20.
D.22.
E. 18.
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?
A. NO33-
B. NO2-
C. NO3-
D. NO32-
E. N3-
What is the correct formula for the oxide ion?
A. O+
B. O2+
C. O2-
D. O3+
E. O-
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
A. AlO.
B. AlO3 .
C.Al2O3 .
D.Al3O2 .
E. Al2O .
A. Mg2S2.
B. MgS.
C. Mg2S.
D.MgS2.
E. Mg2S3.
Which one of the following compounds contains an ion with a 3+ charge?
A. FeCl3
B. CuCl
C. Na2O
D. MgCl2
E. KCl
A. dimagnesium chloride.
B. magnesium chlorine.
C. magnesium chloride.
D. magnesium (II) chloride.
E. magnesium dichloride.
A. O
B. K
C. F
D. Fe
E. Ca
A. Fe2+
B. Fe3+
C. Fe2-
D. Fe3-
E. Fe+
A. Fe2S
B. FeS
C. Fe2S3
D. Fe2S2
E. FeS2
A. aluminum(III) sulfate.
B. dialuminum sulfate.
C. dialuminum trisulfate.
D. aluminum sulfate.
E. dialuminum trisulfide.
A. nitrate
B. hydroxide
C. phosphate
D. bicarbonate
E. sulfate
A. iron sulfate.
B. iron (III) sulfate.
C. iron (II) sulfate.
D. diiron trisulfate.
E. iron trisulfate.
A. Al2NO2
B. AlNO3
C. Al2(NO3)3
D. Al2(NO2)2
E. Al(NO2)3
A. Na2PO3
B. NaPO4
C. Na3PO4
D. Na3PO3
E. Na3P
A. hydrogen sulfite.
B. sulfide.
C. sulfate.
D. sulfite.
E. hydrogen sulfate.
A. hydrogen carbonate
B. hydroxide
C. sulfate
D. ammonium
E. nitrate
A. anion.
B. cation.
C. molecule.
D. polyatomic ion.
E. ionic compound.