ELECTRON CONFIGURATION

ELECTRON CONFIGURATION

By SCC G9

objectives

·I can define the Bohr’s atomic theory and orbital model of an atom. (A)​

·I can explain atomic structure and properties of different elements using illustration (M)

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·I can determine the electron configuration of an atom (A)

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·I can illustrate electron configuration of the different atoms. (T)

How can concept of Electron Configuration helps in understanding the elements?

ESSENTIAL QUESTION

Using the period and groups of the periodic tables of elements, identify the which element is described.

Activity 1: What is that element?

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Multiple Choice

What element is on Period 7, Group 2A?

• Francium

• Flourine

• Radium

• Oxygen

Multiple Choice

What element is on Period 3, Group 3A?

• Magnesium

• Scandium

• Germanium

• Aluminum

Multiple Choice

What element is on Period 4, Group 4A?

• Germanium

• Titanium

• Carbon

• Silicon

1. How did you easily identified the elements?

2. ​What can you say to as we look at the elements’ atomic number from left to right?

Bohr’s atomic theory proposed a model of the atom which looks like a solar system. In this model, the electrons revolve in fixed orbits around the nucleus, as planets do around the sun.

Bohr’s Atomic Theory

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1. Hund’s rule

2. The Aufbau principle​

3. Pauli exclusion principle

Three guiding principles determine an atom’s electron configuration

Hund's Rule

Try this.

Argon has​ 18 electrons here is the electron configuration.. Complete the configuration

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1s²2s²2p⁶3s²3p^_

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Multiple Choice

S orbital has 4 electrons. True or false?

• True

• False

Multiple Choice

How many electrons can d orbital hold?

• 5

• 14

• 10

• 7

Multiple Choice

Which configuration is incorrect?

• 2s2

• 3p6

• 1s2

• 2p7

Multiple Choice

which configuration for Neon (10 electrons) is correct?

1. In an atom, electrons occupy the orbitals in order of increasing energy.

2. . The lower energy levels are filled up first before going to the higher ones. This  order of filling up orbitals  is known as the Aufbau principle.

3. The term Aufbau is a German word which means “building up”.

Aufbau Principle

Potassium has 19 electrons. We need to identify the location of the electrons. We will use the configuration to do so.

Let us try with...

1. Ca (20)

2. Mg​ (12)

Open Ended

What is the correct electron configuration of Flourine (9)

Draw

What is the electron configuration for Silicon (14 electrons) ?

Open Ended

Any questions? Confusion?

Multiple Choice

What is the end configuration Rubidium (Rb)?

• 3p3

• 5p2

• 4s2

• 5s2

Multiple Choice

What is the end configuration Thallium (Tl)?

• 6p6

• 5p2

• 6p1

• 7s2

Multiple Choice

What is the end configuration Scandium (Sc)?

• 4s3

• 4p4

• 4d1

• 5s2

Pauli's Exclusion Principle

According to the Pauli exclusion principle, no more than two electrons can occupy an orbital and these two electrons must have opposite spins.

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1. ​Isa isa lang

2. Up up muna​

3. Balik ka lagi.

Rules for Orbital Diagramming

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let us try

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1. Argon

2. ​ Calcium

Multiple Choice

Is this a correct way of orbital diagramming?

• yes

• no

Multiple Choice

Which of the following orbital diagram is incorrect?

• 1s2

• 2s2

• 2p6

• 3s2

Draw

Draw the next orbital diagram...

Multiple Choice

Which of the orbital diagram is incorrect?

• 1s2

• 2s2

• p4

Open Ended

How can concept of Electron Configuration helps in understanding the elements?

Thank you

Grade 8!

Nice to know you!​

​Some text here about the topic of discussion.