Question

which period 4 element would you expect to have the highest electrical and thermal conductivity?
a. bromine (br)
b. potassium (k)
c. selenium (se
d. arsenic (as)

Explanation:

Metals generally have higher electrical and thermal conductivity than non - metals. Among the given elements:

• Bromine (Br) is a non - metal. Non - metals have poor electrical and thermal conductivity as they do not have free electrons for easy conduction.
• Potassium (K) is a metal. Metals have a sea of delocalized electrons which allows for easy conduction of heat and electricity.
• Selenium (Se) is a non - metal (it is a metalloid in some contexts but still has lower conductivity compared to metals).
• Arsenic (As) is a metalloid. Metalloids have intermediate properties between metals and non - metals, but their conductivity is still less than that of true metals.

Answer:

B. Potassium (K)