Unit 5 Test Review

Who organized elements into triads?

• Moseley

• Mendeleev

• Dobereiner

• Seaborg

Created the first "working" or "credible" periodic table; left blanks for undiscovered elements

• Moseley

• Mendeleev

• Dobereiner

• Seaborg

Organized the periodic table by atomic number

• Moseley

• Mendeleev

• Dobereiner

• Seaborg

Mendeleev organized his table by:

• atomic mass

• atomic radius

• atomic number

• electronegativity

Synthesized many elements and contributed to the modern layout of the periodic table

• Moseley

• Mendeleev

• Dobereiner

• Seaborg

A period is a:

• row

• column

• block

• triad

A group is a:

• row

• column

• block

• triad

The periodic table contains _____ periods.

• 7

• 18

• 118

• 36

The periodic table contains _____ groups or families.

• 7

• 18

• 118

• 36

Alkali metals are in

• Group 1

• Group 2

• Group 17

• Group 18