1. Searching For an Organizing Principle
6.1
Searching For an Organizing Principle
Chemists used the _______________ of elements to sort them into ____________.
Chlorine, bromine, and iodine have very similar ______________ properties.

2. Mendeleev’s Periodic Table
6.1
Mendeleev’s Periodic Table
Mendeleev arranged the elements in his periodic table in order of increasing ____________ _____________.
The periodic table can be used to __________ the ______________ of _________________ elements.

3. Mendeleev’s Periodic Table
6.1
Mendeleev’s Periodic Table
An Early Version of Mendeleev’s Periodic Table
In this early version of Mendeleev’s periodic table, the rows contain elements with similar properties. Observing A fourth element is grouped with chlorine (Cl), bromine (Br), and (I) iodine. What is this element’s symbol?

4. 6.1
The Periodic Law
In the modern periodic table, elements are arranged in order of increasing _______________ _____________.
In the modern periodic table, the elements are arranged in order of increasing atomic number. Interpreting Diagrams How many elements are there in the second period?

5. 6.1
The Periodic Law
The periodic law: When ______________ are arranged in order of increasing ___________ ________________, there is a _____________ __________________ of their ____________ and ____________________ properties.

6. 6.1
The Periodic Law
The properties of the elements within a period ________________ as you move __________ a period from left to right.
The pattern of properties within a period ______________________ as you move from one ________________ to the next.

7. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
Three classes of elements are:
________________,
________________, and
________________.
Across a period, the properties of elements become less ________________ and more ______________.

8. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
___________________ in the Periodic Table
One way to classify elements in the periodic table is as metals, nonmetals, and metalloids. Inferring What is the purpose for the black stair-step line?

9. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
_____________________ in the Periodic Table
One way to classify elements in the periodic table is as metals, nonmetals, and metalloids. Inferring What is the purpose for the black stair-step line?

10. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
____________________________ in the Periodic Table
One way to classify elements in the periodic table is as metals, nonmetals, and metalloids. Inferring What is the purpose for the black stair-step line?

11. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
Metals
Metals are good conductors of __________ and ______________ current.
_______________ of elements are metals.
Metals have:
_________________________,
_________________________.

12. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
Uses of Iron, Copper, and Aluminum
The metals iron, copper, and aluminum have many important uses. How each metal is used is determined by its properties.

13. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
Nonmetals
In general, _______________________ are poor conductors of heat and electric current.
Most nonmetals are _____________ at room temperature.
A few nonmetals are ____________, such as sulfur and phosphorus.
One nonmetal, bromine, is a dark-red ______________________.

14. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
Metalloids
A _______________________ generally has properties that are similar to those of metals and nonmetals.
The _______________ of a metalloid can be controlled by changing conditions.

15. Metals, Nonmetals, and Metalloids
6.1
Metals, Nonmetals, and Metalloids
If a small amount of _________________ is mixed with _________________, the mixture is a good conductor of electric current. ___________________ can be cut into wafers, and used to make ____________ __________.