Chapter 7- Lesson 1 NotesPeriods 1,3,5,7- Notes go on pg 36 and 38. Make sure you create questions for

your notes. On page 35- you will have vocab from230, element key, and a bellringer. On pg 37- you will have the Chapter 7- lesson 1 packet

For periods- 2 and 4- Notes go on pg 34 and 36. Make sure you create questions for your notes. On page 33- you will have vocab from230, element key, and a bellringer. On pg 35- you will have the Chapter 7- lesson 1 packet

Lesson 1-1• The periodic table is a chart of the elements

arranged into rows and columns according to their physical and chemical properties.

• It can be used to determine the relationships among the elements.

What is the periodic table?

Lesson 1-2• When Russian chemist Dimitri Mendeleev was

working on classifying the elements, he placed his list of elements into a table and arranged them in rows of increasing atomic mass.

• Elements with similar properties were grouped in the same column.

Developing a Periodic Table

Lesson 1-2Mendeleev noticed that melting point is one property that shows a repeating pattern.

Lesson 1-2• Boiling point and reactivity also follow a periodic

pattern.

• Mendeleev believed that the atomic masses of certain elements must be invalid because the elements appeared in the wrong place on the periodic table.

• He placed elements whose properties resembled each other’s closer together in the table.

Developing a Periodic Table (cont.)

Lesson 1-2When Moseley listed the elements according to atomic number, columns contained elements with similar properties, such as copper, silver, and gold.

Lesson 1-3You can identify many of the properties of an element from its placement on the periodic table.

Today’s Periodic Table

Lesson 1-3The table is organized into columns, rows, and blocks, which are based on certain patterns of properties.

Lesson 1-3Today’s Periodic Table (cont.)

• The element key shows an element’s chemical symbol, atomic number, and atomic mass.

• The key also contains a symbol that shows the state of matter at room temperature.

Lesson 1-3• A group is a column on the periodic table.

• Elements in the same group have similar chemical properties and react with other elements in similar ways.

Today’s Periodic Table (cont.)

Lesson 1-3• The rows on the periodic table are called periods.

• The atomic number of each element increases by one as you read from left to right across each period.

Today’s Periodic Table (cont.)

Lesson 1-3• Metals are on the left side and in the middle of

the periodic table.

• With the exception of hydrogen, nonmetals are located on the right side of the periodic table.

• Between the metals and the nonmetals on the periodic table are the metalloids.

Today’s Periodic Table (cont.)

Lesson 1-4

Even today, new elements are created in laboratories, named, and added to the present-day periodic table.

How Scientists Use the Periodic Table

Lesson 1-4

• Scientists can use the periodic table to predict the properties of new elements they create.

• The periodic table contains more than 100 elements, each with its unique properties that differ from the properties of other elements.

How Scientists Use the Periodic Table (cont.)