exam 3 review questions

Question 1

The ground state electron configuration for Zn is?

Answer 1

[Ar]4s^23d^10

Question 2

The element that has the valance configuration of 2s^1 is?

Answer 2

Li

Question 3

In which set of elements would all members be expected to have the most similar properties?

Answer 3

K,Rb, Cs (down a row)

Question 4

The effective nuclear charge of an atom is determined by the?

Answer 4

the nuclear charge and number of core electrons.

Question 5

the atomic radius of main-group elements generally decreases from left to right across a period because?

Answer 5

Effective nuclear charge increases from left to right

Question 6

Which ionic compound has the smallest ionic separation?

Answer 6

LiF

Question 7

Of the groups listed, which have the lowest first ionization energies?

Answer 7

Alkaline earth metals

Question 8

The electron affinity of oxygen is represented by which equation?

Answer 8

O (g) + e^- –> O^- (g)

Question 9

Which of the listed oxides is the most acidic?

Answer 9

P4O6

Question 10

Which one of the following is true about alkali metals?

Answer 10

They are readily form ions with a +1 charge.

Question 11

All of the following reactions concerning alkali metals are correct except?

Answer 11

Na(s) + H2(g) –> NaH2 (s)

Question 12

Alkaline earth metals tend to be less reactive than alkali metals because alkaline earth metals have?

Answer 12

higher ionization energies

Question 13

The allotrope of oxygen that is important for absorbing ultraviolet light in the stratosphere is?

Answer 13

O3

Question 14

Element X reacts with oxygen to form an oxide with the formula X2O. When X2O is dissolved in water, the resulting solution is basic. Element X could be

Answer 14

potassium

Question 15

The numbers of valence electrons in the alkali metals, the alkaline earth metals, and the halogens are _____ respectively.

Answer 15

1,2 and 7

Question 16

For ionic compounds as the ionic radius decreases the lattice energy generally

Answer 16

increases if the ionic charges are the same

Question 17

Which ion does not have a closed shell noble gas configuration

Answer 17

S^2+

Question 18

What is the principal quantum number of the valance electrons in atomic calcium?

Answer 18

4

Question 19

In which of the molecules below is the nitrogen-nitrogen distance expected to be the shortest?

Answer 19

N—N (Tripple Bond)

Question 20

A triple bond consists of __ electrons shared between two atoms

Answer 20

6

Question 21

How many single covalent bonds must a sulfur atom form to have a complete octet in its valance shell?

Answer 21

2

Question 22

Ionization energies generally __ from left to right within a period and __ from top to bottom within a group

Answer 22

increase, decrease

Question 23

____ describes the ability of an atom in a molecule to attract electrons

Answer 23

electronegativity

Question 24

How many valence electrons does the species SF6 have?

Answer 24

48

Question 25

What is the formal charge on nitrogen NO-2

Answer 25

0

Question 26

How many equivalent resonance forms can be drawn for the nitrite ion?

Answer 26

2

Question 27

The central atom in ___ is hypervalent

Answer 27

SF6

Question 28

The electron-domain geometry of the central atom in the following is tetrahedral except for which one?

Answer 28

NO-3

Question 29

The molecular geometry of the PF3 molecules is

Answer 29

trigonal pyramidal

Question 30

Using the VSEPR model, the molecular geometry of CIF5 is

Answer 30

square pyramidal

Question 31

Which of the following molecules would be considered nonpolar?

Answer 31

CO2

Question 32

The sp atomic hybrid orbital set accommodates __ electron domains

Answer 32

2

Question 33

The hybridization of the central atom in SiH4 and PH3 are __ and __

Answer 33

sp^3, sp^3

Question 34

The hybridization of carbon in the H-C(triple)C-H molecule is

Answer 34

sp

Question 35

The angles between sp^2 orbitals are?

Answer 35

120

Question 36

There are __ sigma and __ pi bonds in the H2C(triple)CH2 molecule

Answer 36

5,1

Question 37

Mixing one s atomic orbital and one p atomic orbital gives rise to

Answer 37

two sp hybrid orbitals

Question 38

In a typical C(triple)C double bond, the sigma bond results from the overlap of __ orbitals, and the pi bonds result from the overlap of __ orbitals.

Answer 38

sp^2 hybrid, p-atomic

Question 39

Based on molecular orbital theory, the bond order of the bond in the H2+ ion is

Answer 39

0