Periodic Trends

In the 1860's, how many elements were known to mankind?

• About 100

• All of them

• About 60

• About 30

Originally the elements were organized by their:

• Atomic Number

• Atomic Mass/Weight

• Number of Protons

• Number of Neutrons and Electrons

Organizing the elements by atomic weight/mass was periodic.

• True

• False

Why were gaps inserted into the Periodic Table?

• They wanted to keep space between them.

• Some elements were bigger than others.

• Some elements had yet to be discovered.

Looking at the characteristics of Alkali Metals, what would happen if one of them came in contact with water?

• It would melt.

• It would become a solid.

• It would explode

The Alkali metals are considered group (column 1, besides H).

• True

• False

Alkaline Earth Metals are reactive, but not as reactive as Alkali Metals.

• True

• False

Transition metals are good conductors of heat and electricity and are malleable (they can be bent into thin sheets, like Aluminum foil).

• True

• False

The majority of elements are metals.

• True

• False

Halogens love to react (combine) with..

• Anything

• Alkali and Alkaline Earth Metals

• Nothing

• Noble Gases