an atom has electrons in 3 energy levels. in the Bohr model of an atom, the number of core electrons is the number of elevtrons in energy levels

Suppose that a certain fortunate person has a net worth of $71.0 billion ($7.10×1010). if her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?

#20 which type of bond is formed when bases pair in dna? ionic bond covalent bond coordinate bond hydrogen bond

Dalton completing an investigation in the science lab he observes that a sample of liquid turns to gas at 135c what’s this temperature called?