Which two elements on the periodic table are in the same period?
a. sn and rb
b. f and cl
c. k and ba
d. se and te

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17