Question 1

Each atomic orbital is uniquely defined with:

Accepted Answer

A)   Its energy specified by quantum number n.
B)   Its shape specified by quantum numbers l and ml.
C)   Its energy, shape and orientation in space specified by quantum numbers n, l and ml. C

Question 2

As a general trend:

Accepted Answer

A)   atomic radii decrease from left to right in a period because Zeff is increasing in the same direction.
B)   atomic radii decrease from left to right in a period because Zeff is decreasing in the same direction.
C)   atomic radii increase from left to right in a period because Zeff is increasing in the same direction A

Question 3

Which combination of quantum numbers is not allowed?

Accepted Answer

A)   n = 3, l = -2, ml = 2.
B)   n = 4, l = 0, ml = 0.
C)   n = 3, l = 1, ml = -1. A

Question 4

Which of the following statements about oxygen is correct:

Accepted Answer

A)   Oxygen belongs to the p block, has lower I1 value than carbon, is less electronegative than fluorine.
B)   Oxygen is a main group element, is less electronegative than fluorine but more electronegative than nitrogen
C)   Oxygen is a main group element, its atomic radius is greater than atomic radius for fluorine and has core electron configuration of Ne.

Question 5

Atoms of very electronegative elements:

Accepted Answer

A)   have a tendency to attract shared electrons and are found in upper right corner of the periodic table
B)   are metallic elements and are found on the left-hand side of the periodic table
C)   have a tendency to attract electrons and are found in the upper left corner of the periodic table.

Question 6

Which of the following correctly defines the first ionization energy:

Accepted Answer

A)   A(s)  → A+(s)  + e-(g) ; I1 = E(A+, s)  - E(A, s) 
B)   A(g)  → A+(g)  + e-(g) ; I1 = E(A, g)  - E(A+, g) 
C)   A(g)  → A+(g)  + e-(g) ; I1 = E(A+, g)  - E(A, g) .

Question 7

The first ionization energy, generally:

Accepted Answer

A)   is inversely proportional to the square of Zeff and increases from left to right in the period.
B)   is directly proportional to the square of Zeff and increases from left to right in the period
C)   is directly proportional to the square of Zeff and increases from down a group.

Question 8

The 5d subshell is defined with

Accepted Answer

A)   quantum numbers n = 5, l = 2 and four nodes in total
B)   quantum numbers n = 5, ml = 2 and four nodes in total
C)   quantum numbers n = 5, l = 2 and five nodes in total

Question 9

The Pauli exclusion principle tells us that:

Accepted Answer

A)   One orbital can accommodate a maximum of two electrons with opposite signs of quantum number ml.
B)   One orbital can accommodate a maximum of two electrons with opposite signs of quantum number ms.
C)   One orbital can accommodate a maximum of two electrons with opposite signs of quantum number s.

Question 10

Chemical elements are organized in Mendeleev's periodic table. Within the table:

Accepted Answer

A)   each block indicates the shell being filled
B)   elements in the same period have the same core shell electronic configuration
C)   each group corresponds to the completion of one subshell.

Exam 1: Atomic Structure