The valence electrons of a germanium atom in the ground state are located in the
(1) first shell (3) third shell
(2) second shell (4) fourth shell

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.