Please help! History of the Periodic Table When did people first start really looking for patterns in the elements? Why then?

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Compare and contrast the bohr model and the electron cloud models of the atom.

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