What do ta os and rh stand for on the periodic table? transition metals

Ta is Tantalum, Os is Osmium and Rh is Rhodium

Explanation: All of these elements are in the transition metal group. Ta is part of the early transition metals while Os and Rh belongs to the late transition metals.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.