Problem 26
Find at least two dif erent versions of the periodic table and bring a copy of each to class. a. Write down what you think makes these two versions similar to each other. b. Write down what you think makes these two versions difFerent from each other.
Problem 27
Describe how reactivity changes as you go down Group 1A.
Problem 30
Name two elements that have properties similar to those of beryllium, \(\mathrm{Be}\), and have average atomic masses higher than 130.
Problem 32
Which of these elements are nonmetals? a. bromine, \(\mathrm{Br} \quad\) b. carbon, \(\mathrm{C} \quad\) c. boron, \(\mathrm{B}\) d. thallium, \(\mathrm{TI} \quad\) e. phosphorus, \(\mathrm{P} \quad\) f. aluminum, \(\mathrm{Al}\)
Problem 33
Which two of these elements are the least reactive? Explain your thinking. a. chlorine, \(\mathrm{Cl} \quad\) b. barium, \(\mathrm{Ba} \quad\) c. copper, \(\mathrm{Cu}\) d. rubidium, \(\mathrm{Rb} \quad\) e. potassium,\(\mathrm{K} \quad\) f. mercury, \(\mathrm{Hg}\)
Problem 34
Can you make jewelry out of each of the elements listed below? Explain your thinking. a. copper, \(\mathrm{Cu} \quad\) b. neon, \(\mathrm{Ne}\) c. sodium, \(\mathrm{Na} \quad\) d. platinum, \(\mathrm{Pt}\)
