Periodic Table

An element that is a very reactive gas is most likely a member of the...

• noble gases

• alkali metals

• halogens

• actinides

Which of the following metals is most reactive?

• Sodium (Na)

• calcium (Ca)

• titanium (Ti)

• All metals have the same reactivity

The noble gases have ____ electrons in their outer energy levels.

• few

• about a half-complete set of

• an almost complete set of

• a complete set of

Alkali metals are the most reactive of all the metals because they have ____ electron(s) in their outer energy level.

• 1
  
• 2
• 7
• 8

Why would you NOT want to handle alkali metals with your bare hands?

• Alkali metals are acidic and can corrode the skin.

• Alkali metals are gases at room temperature.

• Alkali metals can react with the moisture on your hands and burn your skin.

• Alkali metals are toxic and can be absorbed through your skin.

Which of the following are properties of alkali metals (think back to the demo video)?

• brittle (hard), very reactive

• shiny, soft, reactive

• unreactive, not shiny

• somewhat shiny, brittle (hard)

T or F: Elements in the 18th column are unreactive.

• True

• False

There are more metals than nonmetals on the periodic table.

• True

• False

Valence electrons are...

• the total number of electrons in an atom

• the number of electrons on the first energy shell of an atom

• the number of electrons on the outermost energy shell of an atom

The ______ tells you how many valence electrons an atom has.

• group number

• period number