Procedure: See Periodic Table Lab HandoutReactions with O2 ,H2O (BOTH)

Mg and Ca (Alkaline Earth Metals) Alakali Metals (Sodium, Lithium and Potassium

May use Phenolphtalein (presence of OH-)Reactions with HCl and flame tests for Mg

and Ca(Alkaline Earth Metals)Looking at Hardness for Alkali Metals

Data Data table to collect all important reactions

and observationsMust have titles and labelsObserve strength of reaction between Alkali

metals and Alkaline Metals Compare strength of the reaction within

families and groups

Data Analysis and ConclusionAnswer Questions and Conclusions

What did you discover about reactivity in the periodic table? Use data to support your answer

Periodic TrendsIonization Energy-The amount of energy it

takes to pluck an electron from an element

Atomic Radii (Relates to size)

What patterns did you discover about Ionization Energy and Atomic Size In the periodic table?

Atomic Number

Atomic radius (pm)

How do these traits relate to Reactivity?

Ionization energyIt is easier to pluck an electron from an

element that is close to becoming stable from loosing an electron

Ex Ca has a lower ionization energy than NiNobel gasses have the highest ionization

energy because they are stableThey do not want to loose an electron, Thus

they are not reactiveMetals that have a low ionization energy are

very reactive

Atomic SizeAs you add an energy level you will increase

the size of an atomAs you go down the periodic table size will

increaseTherefore Rb is bigger than K

Elements with more protons will hold elements electrons closer because they are more massiveAs you move from Left to Right in a period

Atomic Size will decrease Therefore S is Larger than Cl

Ionization energy vs Atomic Number

• Ionization energy decreases as you go down the periodic table

• Ex:• Rationale: electrons are farther away from the

pull of the nucleus. They are easier to “pluck off”• Ionization energy decreases as you move from

right to left across the periodic table• Ex: Noble Gasses are the most stable

– They require the most energy to remove because of this

How this relates to reactivityMost reactive Metals are in the Lower left

corner(lowest Ionization Energy,Largest Radius)Most reactive Non metals are in the upper left

corner(Highest Ionization Energy, (WANT ELECTRONS) Smallest

Which Elements do not follow the trend? Why?

Should we do anything else before spring break?Be ready to work hard when you return!! We

will start a new unit bonding when you return!