Module 1_Electron configuration and orbital diagram.pptx
1.
2. The module is about the electron configuration of an atom and its
orbital diagram. After going through this module, you are expected
to:
1. write the electron configuration of an atom
2. draw an orbital diagram to represent the electronic configuration
of atoms
3. recognize the importance of orbital diagram and electronic
configuration of atoms.
3.
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14.
15. Directions: Complete the table below.
ELEMENT ATOMIC NO. ATOMIC MASS NO. OF
PROTONS
NO. OF
ELECTRONS
NO. OF
NEUTRONS
RADON
29
MERCURY
20
30
16. The number of electrons and how these are
arranged in an atom can be used to determine the
chemical properties of an atom. These are usually
dependent on the atom’s number of valence
electrons.
17. In the electron cloud
model, we learn that
electrons are arranged
outside the nucleus of
an atom in a
compartmentalized
way.
18. A representation used by chemist to
denote how electrons are distributed
outside the nucleus of an atom is called
electron configuration.
21. To write the electron configurations and orbital diagrams successfully, you must
formulate a plan of attack and learn the following relationship:
22. The Aufbau principle states that electrons fill lower-energy
atomic orbitals before filling higher-energy ones (Aufbau
is German for "building-up"). By following this rule, we can
predict the electron configurations for atoms or ions.
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24.
25. Which of the following obeys the Aufbau’s principle?
26. Which of the following obeys the Aufbau’s principle?
27. It states that no two electrons in an atom can
have the same set of four quantum numbers. This
means no atomic orbital can contain more than
TWO electrons and these electrons must be of
opposite spin if they are to form a pair within an
orbital.
28.
29. Which of the following obeys the Pauli’s exclusion principle?
30. Which of the following obeys the Pauli’s exclusion principle?
31. It states that in the orbital of the same subshell,
electrons are filled singly first before pairing starts
The most stable arrangement of electrons is one with
the maximum number of unpaired electrons. This
minimized the electron-electron repulsions and
stabilizes the atom.
35. How to write the electron configuration and draw its
orbital diagram of an element:
Step 1: Determine the number of electrons in the
atom that needs to be distributed.
36. How to write the electron configuration and draw its
orbital diagram of an element:
Step 2: Bearing in mind Aufbau principle, look at the electron
configuration mnemonics and proceed to distribute the electrons in the
lower energy level first before moving on to the next. Keep in mind also
the maximum number of electrons in each sublevel. The sum of the
superscripts must be equal to the number of electrons of the atom.
37. How to write the electron configuration and draw its
orbital diagram of an element:
Step 3: Take in the individual
configurations and draw its equivalent
orbital diagram. In drawing the
diagram, bear in mind the Hund’s and
Pauli’s Exclusion Principles. You can
do this in a more organize way by using a
table.
38. ACTIVITIES
ACTIVITY 1
TRUE or FALSE. Read the statements below. Write TRUE if the statement is correct, otherwise, write FALSE.
1. Electron configuration distributes the valence electrons of an atom.
2. The coefficient of a configuration denotes the energy level where the electron is found.
3. In the configuration, 4p3, this means that there are 3 electrons in the p-sublevel of the 4th energy level.
4. According to Aufbau principle, 2p sublevel should be filled first before 2s.
5. The electron configuration mnemonics guides us on how to fill the sublevels according to Aufbau principle.
6. It is possible to have three electrons with different spins in one orbital.
7. Hund’s rule state that you can already pair electrons in an orbital even though there are still orbitals that are
unoccupied.
8. In the second energy level, there are two sublevels available: s and p sublevels
9. The d-sublevel can accommodate a maximum of 10 electrons in its orbitals.
10. Electrons start to occupy the f-sublevel in the 4th energy level of the atom.
39. ACTIVITY 2
Write the electron configuration of the following elements. After
that, using the table presented in the examples, draw the
orbital diagram of each element.
1. Neon
2. Potassium
3. Cobalt
4. Bromine
5. Cerium
40. Writing the electron configuration and drawing the
orbital diagram of an atom requires you to follow at
least three principles. Can you summarize the
statements under these principles?
1. Aufbau Principle
2. Hund’s Rule
3. Pauli’s Exclusion Principle
WRAP–UP
41. Writing the electron configuration and drawing the
orbital diagram of an atom requires you to follow at
least three principles. Can you summarize the
statements under these principles?
1. Aufbau Principle
2. Hund’s Rule
3. Pauli’s Exclusion Principle
WRAP–UP
