Sort the following elements in from least to greatest for each of the trends CI, Hg, Ge, Ne, Cs, Re, As, Ga

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?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?