Section 8.2- Classification Of The Elements Flashcards
Elements in the same group are said to belong to the same
Group
Rows of elements are
Periods
Periods are numbered from
Top to bottom
Are located at the far right of the periodic table
Nonmetals
Are at the left and center of the periodic table
Metals
have properties intermediate between those of metals and nonmetals and is located between
Semi metals or metalloids
Are sometimes called semiconductors
Semimetals
Most common chemical reactions involve the elements in groups 1,2 and 13-18; these elements are called
Main group elements or representative elements
Elements in the middle section of the periodic table- groups 3-12- are
Transition metals
Many __________________ compounds are colored
Transition metal
The two rows of elements set off by themselves below the main table are very similar in properties and are called the
Inner transition metals
The first row of the inner transition metals is known as the
Lanthanide series or rare-earth series
The second row of the inner transition metals which follows actinium is called the
actinide series
Group 1 metals in a main-group classification is
Means plant ash
Alkali metals
Alkali metals are found naturally only as _____________, never as free elements
1+ ions
Group 2 metals are called __________________
Since they have some properties similar to those of the alkali metals but were originally found in the earth rather than ashes
Alkaline earth metals
Groups ____ , ______ , and _____ do not have special names
13 (3A), 14 (4A), 15(5A)
Group 16 (6A) elements do not have widely used name but are sometimes called
Chalcogens
Group 17 are ________________
Means salt-former
Their most common form in naturally occurring compounds is the 1- ion
Halogens
Group 18 contains the
Since they already have a filled valence shell, they do not readily combine with other elements
Noble gases
