Question 1
Which of the following elements forms a +4 oxidation state that is more stable than its +2 oxidation state, and is also found as a significant component of commercial bronze, pewter, red brass, and most solders?
◦ zinc
◦ tin
◦ magnesium
◦ lead
◦ carbon
Question 2
Which of the following has more than one allotrope?
◦ Pb
◦ Cd
◦ Sn
◦ Mg
◦ Al