What will an atom do if it has 1 to 3 valence electrons

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

The process by which liquid water changes into water vapour is called what ?