How many copper ion is present in copper (II) iodide?

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other

Aquantity of that isotope to decay to 1/2 of  its original value

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.