Why is it not possible to have a 2d orbital but a 3d orbital is allowed?​

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these