Matter/ Periodic Table Review

Mendeleev created the first periodic table by arranging elements in order of ___.

• decreasing atomic mass

• increasing atomic mass

• increasing atomic number

• increasing melting points and densities

How did chemists change Mendeleev’s periodic table in the early 1900s?

• They included chemical properties such as bonding power.

• They included physical properties such as melting point and density.

• They used atomic mass instead of atomic number to organize the elements.

• They used atomic number instead of atomic mass to organize the elements.

Most metals are NOT ___.

• ductile

• good conductors of heat and electricity

• liquid at room temperature

• malleable

In the periodic table, the most reactive metals are found ___.

• in Group 1, the first column on the left

• in Period 1, the first row across the top

• in Groups 13 through 16 in the center

• in Periods 6 and 7 at the bottom

Which group contains the most elements?

• metalloids

• nonmetals

• metals

• transition elements

A material is said to be ductile if it ___.

• can be pulled out, or drawn, into a long wire

• can be hammered or rolled into flat sheets and other shapes

• can transfer heat or electricity to another material

• is a mixture of a metal with at least one other element

In an atom, the number of protons equals the number of ___.

• nuclei

• electrons

• neutrons

• isotopes

The elements in a column of the periodic table ___.

• have similar properties

• are in the same period

• have the same atomic mass

• have very similar chemical symbols

What information in the periodic table indicates the number of protons in an atom?

• the position of the element in its column

• the element’s chemical symbol

• the element’s atomic number

• the element’s atomic mass

The two most common alkaline earth metals are ___.

• copper and zinc

• iron and silver

• sodium and potassium

• calcium and magnesium