Electronic Structure of the Atom
Second Quarter - Module 1
Reminder: Read and understand the module first before answering your worksheet.
Direction: Encircle the letter of the best answer.
1. What is the maximum number of electrons in an atom that can have the following set of
quantum numbers?
n= 4 l = 3 ml = –2 ms = + ½
A. 0 B. 1 C. 2 D. 6
2. Electrons in an orbital with l=3 is in a/an
A. d orbital B. f orbital C. g orbital D. p orbital
3. What is the total number of electrons possible in the 6s orbital?
A. 1 B. 2 C. 3 D. 4
4. What is the total number of electrons possible in the 2p orbitals?
A. 2 B. 4 C. 6 D. 8
5. Which of the four quantum numbers determine the shape of an orbital?
A. n B. ℓ C. ms D. mℓ
6. “No two electrons in an atom can have the same four quantum numbers” is a statement of
A. Pauli exclusion principle C. Hund’s rule
B. Bohr’s equation D. de Broglie’s relation
7. For all atoms of the same element, the 2s orbital is _______ the 1s orbital.
A. same as B. larger than C. smaller than d. none of these
8. Which element has the following ground-state electron configuration? 1s 22s22p63s2 A. Na
B. Mg C. Al D. Si
9. Which ground-state atom has an electron configuration described by the following orbital
diagram?
A. Phosphorus B. Nitrogen C. Arsenic D. Vanadium
10. A neon atom in its ground state will be ____________.
A. paramagnetic B. diamagnetic C. excited D. none of these
Activity 1. Quantum Numbers
Activity 1.1. Direction: Given the last sublevel configuration, identify the set of quantum
numbers of the following.
Last Sublevel n ℓ mℓ ms
Configuration
1. 1s1
2. 4p6
3. 5d8
4. 3p3
5. 2s2
6. 2p3
7. 3p5
8. 4s1
9. 4p6
10. 3d6
Activity 2. Electronic Configuration
2
Activity 2.1. Fill in the following table and identify which of the ten elements has the highest
magnetic properties (most paramagnetic)?
Number
Orbital Diagram Electron Paramagnetic No. of
Atomic
Element Number of Configuration or Unpaired
Electrons Electrons
Diamagnetic
H
He
Li
Be
Ne
Activity 2.2. Using noble gas cores, write the shorthand electron configuration of the
following:
a. Zn f. Ag
b. Ba g. Pb
c. Mg h. As
d. Co i. B
e. P j. W
Note: You can also watch the video lesson of your chemistry teacher or using the following link:
● https://www.youtube.com/watch?v=J-DjEIlynjE
● https://www.youtube.com/watch?v=diCGRJskeDA
● https://www.youtube.com/watch?v=Aoi4j8es4gQ
● https://www.youtube.com/watch?v=accyCUzasa0
Activity 3
All the words are hidden vertically, horizontally, or diagonally in both directions. The letters that remain unused
form a sentence from left to right. Look for the two sentences in the puzzle and discuss it briefly.
-PAULI EXCLUSION -ORBITAL -ANGULAR
-QUANTUM NUMBERS -PARAMAGNETIC
-HUNDS RULE -ELECTRON SPIN
-MAGNETIC QUANTUM -S ORBITAL
-PRINCIPAL QUANTUM -ATOMIC ORBITALS
-ELECTRON CONFIGURATION -F ORBITAL -MADELUNGS
RULE -D ORBITAL -SUBLEVEL AUFBAU -DIAMAGNETIC
-GROUND STATE
First Sentence:
Discussion:
Second Sentence:
Discussion:
Activity 4:
Activity 4.1: Direction: Rearrange the letters of the correct term that is described by the
corresponding statement. Write your answer on the space provided.
3
_______1. BELSUVLES – It is designated by letters s, p, d, f, g, …
_______2. OLETERCN – It is the particle that can be described by four quantum numbers.
_______3. YEERNG VLELE – It is being represented by n.
_______4. GUROND TASTE – It is the most stable state of the electron in the hydrogen astom.
_______5. HERPES – It is the shape of the s orbital.
Activity 4.2. Direction: Write the electronic configuration and draw the orbital diagram for
each element.
Sodium 6. Potassium
Beryllium 7. Chlorine
Carbon 8. Krypton
Oxygen 9. Calcium
Aluminum 10. Lithium
Direction:
Encircle the letter of the best answer.
1. How many electrons are there in the 3rd principal energy level (n=3) of a phosphorus atom?
A. 4 B. 5 C. 6 D. 7
2. The maximum number of electrons that can occupy an energy level described by the principal
quantum number, n, is
A. 2n2 B. 2n C. n+1 D. n
3. How many orbitals are allowed in a subshell if the angular momentum number for electrons in
that subshell is 3?
A. 1 B. 3 C. 5 D. 7
4. Which of the following is a diamagnetic?
A. O B. F C. Ne D. N
5. A ground-state atom of iron has ____ unpaired electrons and is _______.
A. 4,paramagnetic B. 0,diamagnetic C. 3,paramagnetic D. 1,diamagnetic
6. Which element has the following ground-state electron configuration? [Kr]5s 24d105p3
A. Ar B. I C. Sb D. Se
7. The electron configuration of a ground-state Vanadium atom is
A. [Ar]4s24d3 B. [Ar]4s24p3 C. [Ar]4s23d3 D. [Ar]3d5
8. A possible set of quantum numbers for the last electron added to complete an atom of
Germanium (Ge) in its ground state is
n ℓ mℓ ms
A. 4 0 0 +½
B. 3 0 +1 -½
C. 4 1 -1 +½
D. 3 1 +1 -½
9. The orbital diagram for a ground-state oxygen atom is
10. Which ground-state atom has an electron configuration described by the following orbital
diagram?
A. Phosphorus B. Germanium C. Selenium D. None of these
