Question

Which class of elements will contain both solids and gases at room temperature?

Answer 1

The  class of  non  metal  are  the  one  which  will   contain  both  solid  and  gases  at  room  temperature.  Example  in  halogen    iodine  is  always  in  solid  state  while   chlorine  and  flurorine are  gases   at   room  temperature. Metals,   and  inner  transition  metals  are  solids  at are  all  solids  at  room  temperature.

Answer 2

The nonmetals, as s class of elements contains both solids and gases at room temperature. 
Some gases classed as nonmetals are : hydrogen, helium, oxygen, nitrogen, fluorine, neon, or radon and many others. An example of a solid that is a nonmetal is sulfur.