, Main groups Main groups
1 18
Periods 1A 8A
2 13 14 15 16 17
1 2A 3A 4A 5A 6A 7A
Transition metal groups
2
3 4 5 6 7 8 9 10 11 12
3 3B 4B 5B 6B 7B 8B 1B 2B
4
5
6
7
Lanthanides
Actinides
Elements are organized into 18 vertical columns, or groups, and 7 horizontal rows, or
periods. The two groups on the left and the six on the right are the main groups; the ten in
the middle are the transition metal groups. The 14 elements beginning with lanthanum are
the lanthanides, and the 14 elements beginning with actinium are the actinides. Together,
the lanthanides and actinides are known as the inner transition metal groups. Two systems
for numbering the groups are shown above the top row and are explained in the text.
,Those elements (except hydrogen) on the left side of the zigzag line running from
boron (B) to astatine (At) are metals; those elements (plus hydrogen) to the right of
the line are nonmetals; and seven of the nine elements abutting the line are
metalloids, or semimetals.
Metals Semimetals Nonmetals
, CHEMISTRY
SIXTH EDITION
JOHN E. M C MURRY
Cornell University
ROBERT C. FAY
Cornell University
With Contributions by
JORDAN FANTINI
Denison University
1 18
Periods 1A 8A
2 13 14 15 16 17
1 2A 3A 4A 5A 6A 7A
Transition metal groups
2
3 4 5 6 7 8 9 10 11 12
3 3B 4B 5B 6B 7B 8B 1B 2B
4
5
6
7
Lanthanides
Actinides
Elements are organized into 18 vertical columns, or groups, and 7 horizontal rows, or
periods. The two groups on the left and the six on the right are the main groups; the ten in
the middle are the transition metal groups. The 14 elements beginning with lanthanum are
the lanthanides, and the 14 elements beginning with actinium are the actinides. Together,
the lanthanides and actinides are known as the inner transition metal groups. Two systems
for numbering the groups are shown above the top row and are explained in the text.
,Those elements (except hydrogen) on the left side of the zigzag line running from
boron (B) to astatine (At) are metals; those elements (plus hydrogen) to the right of
the line are nonmetals; and seven of the nine elements abutting the line are
metalloids, or semimetals.
Metals Semimetals Nonmetals
, CHEMISTRY
SIXTH EDITION
JOHN E. M C MURRY
Cornell University
ROBERT C. FAY
Cornell University
With Contributions by
JORDAN FANTINI
Denison University
