4. Mendeleev arranged the elements in
his periodic table in order of
increasing atomic mass.
Mendeleev’s
periodic table was
used to predict
the properties of
undiscovered
elements.
6. In the modern periodic table,
elements are arranged in order
of increasing atomic number.
7.
8. The periodic law: When elements are
arranged in order of increasing atomic
number, there is a periodic repetition of
their physical and chemical properties.
–The properties of the elements within a
period change as you move across a
period from left to right.
–The pattern of properties within a period
repeats as you move from one period to
10. Any square with a side on the stair-
step line is a metalloid (semi-metal),
EXCEPT ALUMINUM.
11. Any square with a side on the stair-
step line is a metalloid (semi-metal),
EXCEPT ALUMINUM.
Across a period, the properties of elements
become less metallic and more nonmetallic.
16. Metals are good conductors of heat
and electric current.
–80% of elements are metals.
–Metals have a high luster, are
ductile, and are malleable.
–Metals tend to lose electrons.
21. In general, nonmetals are poor
conductors of heat and electric
current.
–Non-metals tend to gain e-
–Most nonmetals are gases at room
temperature.
–A few nonmetals are solids, like sulfur,
carbon, and phosphorus.
22.
23. A metalloid generally has
properties that are similar to those
of metals and nonmetals.
•Also called semi-metals
The behavior of a metalloid can be
controlled by changing conditions.
24. If a small amount of boron is mixed with
silicon, the mixture is a good conductor of
electric current. Silicon can be cut into
wafers, and used to make computer chips.
25. The periodic table displays the symbols
and names of the elements, along with
information about the structure of their
atoms.
28. In their elemental form alkali metals
are extremely reactive, so they are not
naturally found in elemental form.
search youtube for brainiac alkali metal to watch this video at home
29. In their elemental form alkali metals
are extremely reactive, so they are not
naturally found in elemental form.
search youtube for brainiac alkali metal to watch this video at home
30. The Group 2A elements are
called alkaline earth metals.
34. The Representative Elements
Elements in groups 1A through 7A are
often referred to as representative elements
because they display a wide range of
physical and chemical properties.
Chlorine, bromine, and iodine have very similar chemical properties. The numbers shown are the average atomic masses for these elements.
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?
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?
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?
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?
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?
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?
The metals iron, copper, and aluminum have many important uses. How each metal is used is determined by its properties.
The metals iron, copper, and aluminum have many important uses. How each metal is used is determined by its properties.
The metals iron, copper, and aluminum have many important uses. How each metal is used is determined by its properties.
This is the element square for sodium from the periodic table. Interpreting Diagrams What does the data in the square tell you about the structure of sodium atoms?
In this periodic table, the colors of the boxes are used to classify representative elements and transition elements.
In this periodic table, the colors of the boxes are used to classify representative elements and transition elements.
In this periodic table, the colors of the boxes are used to classify representative elements and transition elements.
In this periodic table, the colors of the boxes are used to classify representative elements and transition elements.
This blimp contains helium, one of the noble gases. Applying Concepts What does the ability of a helium-filled blimp to rise in air tell you about the density of helium?
Some of the representative elements exist in nature as elements. Others are found only in compounds.
Some of the representative elements exist in nature as elements. Others are found only in compounds.
Some of the representative elements exist in nature as elements. Others are found only in compounds.
Some of the representative elements exist in nature as elements. Others are found only in compounds.