A radioactive nucleus can change from one element to another. How does this happen?

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

One does not belong why? ice, gold ,wood ,diamond and table salt