Ch. 3: “Atoms & the Ch. 3: “Atoms & the Periodic Table”Periodic Table”

Section 3: “Families of Section 3: “Families of Elements”Elements”

1. Classify the following 1. Classify the following based on their position on based on their position on the periodic table.the periodic table.a. Fea. Fe transition metaltransition metal

b. Kb. K alkali metalalkali metal

c. Src. Sr alkaline-earth metalalkaline-earth metal

d. Ptd. Pt transition metaltransition metal

2. Predict whether 2. Predict whether cesium forms Cscesium forms Cs++ or or CsCs2+2+ ions. ions. Cesium is an alkali metal, so it Cesium is an alkali metal, so it

has one valence electron that is has one valence electron that is removed to form a Csremoved to form a Cs++ ion. ion.

3. Describe why chemists might 3. Describe why chemists might sometimes store reactive chemicals in sometimes store reactive chemicals in argon, Ar. To which family does argon argon, Ar. To which family does argon belong?belong?

Reactive chemicals might react Reactive chemicals might react with oxygen or water vapor in the with oxygen or water vapor in the air. They will not react with argon air. They will not react with argon because it is inert.because it is inert.

Argon is a noble gas.Argon is a noble gas.

4. Determine whether the 4. Determine whether the following substances are following substances are likely to be metals or likely to be metals or nonmetals:nonmetals:a. a shiny substance used to make flexible a. a shiny substance used to make flexible

bed springsbed springs metalmetalb. a yellow powder from underground b. a yellow powder from underground

minesmines nonmetalnonmetalc. a gas that does not reactc. a gas that does not react nonmetalnonmetald. a conducting material used within d. a conducting material used within

flexible wiresflexible wires metalmetal

5. Describe why atoms of 5. Describe why atoms of bromine, Br, are so reactive. bromine, Br, are so reactive. To which family does bromine To which family does bromine belong?belong? Bromine, a halogen, is one Bromine, a halogen, is one

electron short of having 8 valence electron short of having 8 valence electrons. It will readily react electrons. It will readily react with an element that can supply with an element that can supply that electron.that electron.

6. Predict the charge 6. Predict the charge of a beryllium ion.of a beryllium ion. Beryllium is an alkaline-earth Beryllium is an alkaline-earth

metal. Therefore, it has two metal. Therefore, it has two valence electrons that can be valence electrons that can be removed to form a Beremoved to form a Be2+2+ ion. ion.

7. Identify which element is 7. Identify which element is more reactive: lithium, Li, more reactive: lithium, Li, or barium, Ba.or barium, Ba. Lithium is an alkali metal and is Lithium is an alkali metal and is

more reactive than an alkaline-more reactive than an alkaline-earth metal such as barium.earth metal such as barium.

8. Critical Thinking: How can 8. Critical Thinking: How can you determine if a metal is an you determine if a metal is an alkali, alkaline-earth, or alkali, alkaline-earth, or transition metal?transition metal? Check the reactivity of the metal Check the reactivity of the metal

against the reactivities of other against the reactivities of other alkali, alkaline-earth, and alkali, alkaline-earth, and transition metals. The element transition metals. The element belongs to the group that is most belongs to the group that is most similar to the element chemically.similar to the element chemically.