When positively charged particles were radiated onto a gold atom, a few of the particles bounced back. Which of the following caused this?

How many miles of water are produced if 5.43 mol pbo2 are consumed

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation