Protons and neutrons
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C) powdered sugar in hot water because the sugar is already broken so it would be more faster than sugar cube in hot water
exactly 1 molecule of water is H2O just 1 is the answer

The nucleus of an atom of the element is positively charged and atom has a hollow space inside it.
Explanation:
This experiment was conducted by Rutherford in this experiment. He placed a gold foil and surround it with a screen.
And He exposed gold foil in alpha particles rays in which he noticed that most rays passed through atom which conclude that atom has a large space, some rays get deflected and some reverse their path this show that the positive charge of nucleus of an atom.
A. Crust B. Mantle C. Outer Core D. Inner Core, i just studied that