2. Jessica, at a constant slow speed, moved a 1 kg book from a 2 m high shelf to the floor.
How much work did she do on the book?

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Idon't know hope someone you

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood.