Electron Configuration and Periodic Table

Electron configuration

Chemistry - Starter questions

1

State and explain one way in which Mendeleev improve newlands periodic table

2

Why did mendeleev leave gaps for undiscovered elements in the periodic table

3

Why is it called the periodic table

4

What are metals?

5

What are non-metals?

6

State one physical property of metals

KO 1

Chemistry - starter questions

1

Left gaps for undiscovered elements - so that elements were in their correct group
Did not always follow order of relative atomic masses - so that elements were in their
correct group

2

So that elements with similar properties could be placed together

3

Similar properties occur at regular intervals.

4

Elements that form positive ions.

5

Elements that do not form positive ions

6

Good electrical conductor, good thermal conductor, strong, high boiling point, high
melting point, malleable.

Green pen your answers

Electron configuration

KO 1

Electrons don’t all pile into the atom randomly, they fill different energy
levels or ‘shells’. There are rules explaining how they fill. Understanding
this will help you to draw atoms and understand the periodic table.

1st shell holds a maximum of 2 electrons

2nd shell holds a maximum of 8 electrons

3rd shell holds a maximum of 8 electrons

Electron configuration

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Electron configuration

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Sodium has 11 electrons,
we can tell this because it
has the atomic number 11.
Sodium’s first 2 electrons
go in the first shell, then 8 in
the second shell, leaving 1
left in the outer shell.
We can write this in
numbers as 2,8,1 or show
this on a diagram

Electron configuration

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Electron configuration

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Electron configuration

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Chemsitry - CFU

1

Draw the electron configuration for potassium, lithium and helium

Electron configuration

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Electron configuration

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Electron configuration

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Electron configuration

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Multiple Choice

What is the electron configuration of sodium?

• 2.8
• 2.8.2
• 2.8.1
• 11

Multiple Choice

What subatomic particles would you find in the nucleus of an atom

• protons and neutrons

• protons and electrons

• protons only

• electrons and neutrons

Multiple Choice

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number

• 35

• 15

• 25

• 20

Multiple Choice

How many electrons can the first energy level hold

• 0

• 4

• 8

• 2

Multiple Choice

Rows on the period table are called _____ while columns are called _____

• groups, families

• periods, groups

• groups, periods

• families, groups

Multiple Choice

Which particle carries no charge?

• Neutrons

• Electrons

• Protons

Multiple Choice

Where are electrons of an atom found?

• Nucleus
• Electron Cloud
• Some are in the nucleus and some in the electron cloud.
• They are moving everywhere.

Multiple Choice

• 10

• 2

• 8

• 18

Multiple Choice

• 14

• 4

• 3

• 28

Periodic Table

8.P.1.2 Explain how the physical properties of elements and their reactivity have been used to produce the current model of the Periodic Table of elements.

Classifying Matter

• Elements: pure substances, on the Periodic Table

• Compounds: two or more elements; parts on the Periodic Table

• Mixtures: two or more substances MIXED; not on Periodic Table

Multiple Select

Choose all the items that are elements.

• NaCl (table salt)

• Sulfur

• O₂

• Water

• Air

Multiple Select

Choose all of the items that are compounds.

• NaCl (table salt)

• Sulfur

• O₂

• Water

• Air

Multiple Select

Choose all of the items that are mixtures

• NaCl (table salt)

• Sulfur

• O₂

• water

• Air

Groups & Periods

• Groups: Columns; up & down, similar properties. ⬆️ ⬇️

• Periods: Rows; left to right; increasing atomic ➡️ ⬅️

Multiple Choice

Which element is similar to Li?

• Be

• K

Multiple Choice

Which element is similar to Mg?

• Ca

• B

Multiple Choice

Which element is similar to B?

• C

• Al

Multiple Choice

Which element is similar to F?

• Ne

• Cl

Multiple Choice

Which element is similar to He?

• H

• Ar

Reactivity

• ability of a substance to react

• decreases left ➡️ to right ⬅️

• Group 1 Alkali Metals are most reactive

• Group 18 Noble Gases are least reactive, inert

Multiple Choice

Which element is the least reactive?

• Li

• Ne

• B

• C

Multiple Choice

Which element is the least reactive?

• Mg

• Na

• C

• S

Multiple Choice

Which choice shows the elements in order from most reactive to least reactive. Sr, K, Cl, P

• Sr, K, Cl, P

• K, Cl, Sr, P

• K,P, Sr, Cl

• K, Sr, P, Cl

Metals, Nonmetals, Metalloids

• Metals: ductile, malleable, luster, solids

• Metalloids: properties of metals & nonmetals

• Nonmetals: brittle & dull

Multiple Choice

Students in Mrs. Clark's science class are investigating a substance that has the following properties

-shiny

-bends easily

-hard, not easily broken

Based on these properties how would you classify the substance?

• metal

• nonmetal

• metalloid

Multiple Choice

Which best describes the sequence of the elements in Period 5 of the periodic table?

• highly reactive gases, relatively nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

• highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases

• nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

• nonreactive gases, nonreactive metals, highly reactive metals, metalloids,

  reactive nonmetals, reactive gases

Update the DPR

Electron configuration

KO 1

Multiple Choice

What is the electron configuration of calcium?

• 2.8.8.2
• 2.8.10
• 20
• 2.18.2

Multiple Choice

Which element has an electron configuration of 2.5?

• Oxygen
• Nitrogen
• Phosphorus
• Carbon

Multiple Choice

Which element has an electron configuration of 2.8.8?

• Lead
• Flourine
• Neon
• Argon

Multiple Choice

What is the electron configuration of Aluminium?

• 2.8.3
• 2.11
• 13
• 2.8.2

Multiple Choice

What is the electron configuration of chlorine?

• 17
• 2.7
• 2.8.7
• 2.8.4

Multiple Choice

Which element has the electron configuration of 2.8.2?

• Magnesium
• Sodium
• Sulfur
• Arsenic

Multiple Choice

Which element has the electron configuration of 2.8.4?

• Neon
• Boron
• Gallium
• Silicon

Multiple Choice

What is the electron configuration of beryllium?

• 2.2
• 2.4
• 4
• 6

Multiple Choice

Which element has the electron configuration of 2.7?

• Krypton
• Iodine
• Flourine
• Barium

Open Ended

Explain why the reactivity of elements changes going down group 1

Open Ended

Explain why the reactivity of elements changes going down group 7