1.) how many periods are on the periodic table? are periods the columns or the rows on the periodic table?

The concept of empiricism states that all rationally accepted knowledge is determined from experience. francis bacon was one of the first scientists to promote this theory. what was it’s impact on society?

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax