1、There are __________ paired and __________ unpaired electrons in the Lewis symbol for a phosphorus atom.
A、0, 3
B、2, 4
C、4, 3
D、2, 3
E、4, 2
2、There are __________ unpaired electrons in the Lewis symbol for an oxygen atom.
A、3
B、0
C、2
D、4
E、1
3、The electron configuration of the phosphide ion (P3- ) is __________.
A、[Ne]3s23p6
B、[Ne]3s2
C、[Ne]3s23p1
D、[Ne]3s23p3
E、[Ne]3p2
4、Elements from opposite sides of the periodic table tend to form __________.
A、homonuclear diatomic compounds
B、covalent compounds that are gaseous at room temperature
C、ionic compounds
D、compounds that are gaseous at room temperature
E、covalent compounds
5、Determining lattice energy from Born-Haber cycle data requires the use of __________.
A、the octet rule
B、Hess’s law
C、Periodic law
D、Coulomb’s law
E、Avogadro’s number
6、How many hydrogen atoms must bond to silicon to give it an octet of valence electrons?
A、4
B、5
C、3
D、1
E、2
7、In the molecule below, which atom has the largest partial negative charge __________?
A、C
B、Br
C、I
D、F
E、Cl
8、Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.
A、increases, stays the same
B、increases, increases
C、stays the same, increases
D、increases, decreases
E、decreases, increases
9、The Lewis structure of AsH3 shows __________ nonbonding electron pair(s) on As.
A、1
B、This cannot be determined from the data given.
C、3
D、0
E、2
10、The formal charge on carbon in the molecule below is __________.
A、1
B、3
C、2
D、0
E、-1
