5.1 Organizing the Elements

A(n) ____ is an arrangement of elements in columns, based on a set of properties that repeat from row to row.

• chemical formula

• Periodic table

• chemical reaction

• chemical chart

As the number of known elements grew, so did the need to organize them into groups based on their properties.

• True

• False

The first elements to be identified were mainly gases including the Noble gases.

• True

• False

Mendeleev knew the name, relative mass and the properties of the 63 ____ known at the time.

• compounds

• molecules

• elements

• gasses

Mendeleev arranged the elements into rows in order of increasing mass so that elements with similar ____ were in the same column.

• names

• origins

• properties

• discoverers

Mendeleev left some locations in his periodic table blank for ____ elements.

• non-Russian

• hard to pronounce

• reactive

• undiscovered

Mendeleev used the properties of elements located near the spaces in his table to predict ____ for undiscovered elements.

• names

• properties

• discovery dates

• discovery locations

The close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be.

• True

• False

Mendeleev was the first, and only, scientist to arrange elements in a periodic table.

• True

• False

Mendeleev arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same ____.

• row

• atomic number

• column (group)

• zone