The answer is System.
When a scientific investigation is in progress, its used to perform and understand the natural phenomenon that goes on using the scientific method. Since this is a descriptive investigation, it provides a descriptive account of any system by looking at it without any prior knowledge to that subject. This method of investigation does not use a hypothesis. Thus, proves our answer correct.
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The mass of the product in a chemical reaction must be equal the mass of the reactants.
The three broad classes of elements are:
Metals
Metalloids
Nonmetals
Is there anymore to the question?
Hello! Rutherford’s gold foil experiment was actually really cool. While he put a beam of alpha particles into a sheet of gold foil, a few of those particles were easily deflected. He soon discovered that the reason those particles being deflected was because a little tiny nucleus. He was the one who found out the nuclear theory of an atom. I hope this was one of your answers. If not, feel free to message me and tell me your options. I’ll help you as much as I can. Have a great day! :)