CHEMISTRY DEC. 5 & 6, 2017

•OBJECTIVE: Students will

 describe and explain how

 various factors change across

 a period and down a group.

•W.O.D. innocuous-harmless

•WARM-UP

•1 Define the following terms:

 atomic radius, electronegativity, ionization

 energy, & ion.

HW

•Study for a test on the periodic table on Dec.

 11th (b day) and 12th (a day). No notes will be

 allowed

CW-understanding trends by interpreting graphs

•       Complete on loose-leaf paper

1.     Using the graph on page 175, fig. 6.15

(a)  Which alkali metal has an atomic
 radius of 238 pm?

(b)  Based on the graph, which element in 

group 1 (1A) has the (i) smallest radius

 (ii)largest radius

(c)   Based on the graph, how does atomic

 radii change going down a group for (i)

 alkali metals (ii) noble gases? Explain

 your answer

(d)   Based on the graph, what is the
 atomic radius for (i) Na (ii) Al

(e)  Using the graph, describe how atomic

 radii changes across period 3? Explain

 your answer.

(f)   Is an atom of barium, atomic number 
56, smaller or larger than an atom of Cs?

 Explain your answer.

2.     Using the data table on page 177

(a)  What are the values for the 1^st , 2^nd , 3^rd , ionization energies for sodium,

 and aluminum?

(b)  For the elements in period 2, describe how 1^st ionization energy

 changes across a period? Explain your

 answer.

(c)   For the elements in group 1, how does the values for 1^st ionization

 energy change down a group? Explain

 your answer.

(d)  Is it easier to remove an electron
 from a sodium or aluminum atom?

 Explain your answer.