Определите номера периода, группы, количество электронов, протонов, нейтронов, заряд ядра, принадлежность к металлам или неметаллам элемента №12 (срочно)

Why did southern business leaders want to increase the number of slaves

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

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