4. Mendeleev arranged the elements in
his periodic table in order of
increasing atomic mass.
5. 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.
7. In the modern periodic table,
elements are arranged in order
of increasing atomic number.
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.
9. 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.
10. 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
the next.
14. Any square with a side on the stair-
step line is a metalloid (semi-metal),
EXCEPT ALUMINUM.
15. 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.
18. Metals are good conductors of
heat and electric current.
–80% of elements are metals.
19. Metals are good conductors of
heat and electric current.
–80% of elements are metals.
–Metals have a high luster, are
ductile, and are malleable.
20. 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. 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.
–All metals are solids, except Hg.
26. In general, nonmetals are poor
conductors of heat and electric
current.
–Non-metals tend to gain e-
27. In general, nonmetals are poor
conductors of heat and electric
current.
–Non-metals tend to gain e-
–Most non-metals are gases, but
some are solids or liquids.
28. In general, nonmetals are poor
conductors of heat and electric
current.
–Non-metals tend to gain e-
–Most non-metals are gases, but
some are solids or liquids.
–A few nonmetals are solids, like
sulfur, carbon, and phosphorus.
–Bromine is a dark-red liquid.
29.
30. A metalloid has some metallic and
non-metallic properties.
•Also called semi-metals
The behavior of a metalloid can be
controlled by changing conditions.
31. 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.
32. The periodic table displays the symbols
and names of the elements, along with
information about the structure of their
atoms.
34. The Group 1 (1A) elements are
called alkali metals.
1A
35. 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
36. 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
37. The Group 2 (2A) elements are
called alkaline earth metals.
2A
41. 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.
