Structure of an Atom

Quizizz Lesson

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Atomic Structure and the Periodic Table

​You will need your class notes and your periodic table.

• The Periodic Table is organized by increasing atomic number.

• ​Atomic Number = Number of Protons

• There are 7 rows

• There are 18 groups.

• Each group has the same number of valence electrons

Poll

How many Groups are in the Periodic Table?

• 2

• 7

• 8

• 18

Poll

What is the maximum number of energy levels in an atom?

• We have no way to know

• up to 7

  Each row adds another energy level

• up to 18

Models: An atomic image focusing on electrons

• The nucleus is a single ball in the center

• The large gold spheres represent electrons

• The rings represent energy levels

Multiple Choice

What is the atomic number for this atom?

• 2

• 8

• 7

• 5

Open Ended

What is this element?

Model of a Nitrogen Atom

​How do you know?

• 7 total electrons = 7 protons = atomic number 7

OR

• 5 valence electrons - Group 15

• 2 rings - second row of the Periodic Table

Can you identify these two atoms?

​Write your guess on a piece of scrap paper. Then check it on the next slide.

​One Valence Electron (Group 1)

​Two Rings so second row of periodic table

​One Valence Electron (Group 1)

​Three Rings so third row of periodic table

First atom

​Group 1, Second Row = Lithium

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​It also has 3 total electrons so Atomic Number of 3 = Lithium

​Second atom

​Group 1, Third Row = Sodium

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​It also has 11 total electrons so Atomic Number of 11 = Sodium

What are these elements? Answer on scrap paper, then check on the next slide.

• Top: Valence Electrons = ______, Rings = 2

• Element =

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• Lower: Valence Electrons = ____ Rings = 3

• Element =

What are these elements?

• Top: Valence Electrons = 7,

• Rings = 2

• ELEMENT = Fluorine

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• Lower: Valence Electrons = 7

• Rings = 3

• ELEMENT = Chlorine

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Nobel Gases have full outer energy levels

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​The Octet Rule

• The first energy level can hold only 2 electrons

• All others want 8 to be stable (happy)

• An atom want either a full or an empty outer energy level

Multiple Choice

TRUE OR FALSE Lithium and Beryllium have the same number of valence electron.

• TRUE

• FALSE

Multiple Choice

How many valence electrons does Na have?

• 1

• 5

• 6

• 11

Multiple Choice

Chlorine ( Cl) has _________ valence electrons.

• 3

• 5

• 7

• 8

​Atoms form bonds to be stable. These are now compounds.

Multiple Choice

Valence electrons play a key role in chemical reactions their number increases from left to right across a row of the periodic table.

• TRUE

• FALSE