How do you determine the type of ion charge any element will form based on its number of valence electrons?

How much energy moves onto the next level, in an energy pyramid

Acompound contains c, h, and o atoms. when 1.130 g of the compound is burned in oxygen, 1.064 g co2 and 0.3631 g h2o are produced. what is the empirical formula of this compound?

Why do cells appear different in distilled water than they do in 10% salt water?