1. Which electron configuration could represent the electrons in a sodium atom in an excited state?

How are isotopes of the same chemical element alike? how are they different?

Drug abuse will not lead to physical and psychological dependence. true or false ?

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth