1. which of the following is a brittle solid?
a. chlorine b. bromine c. iodine
d. sulfur 2. which of the following elements belong to the p6-block of the periodic table?
a. halogens b. alkali metals c. alkaline earth metals d. noble gases 3 . which of the following elements belongs to the p-block? a. oxygen b. cobalt c. rubidium d. hydrogen 4. how many valence electrons are found in phosphorus? a. 3 b. 5 c. 7 d. 8