Answer:
A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits
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I am thinking it is c) A microscope is used to magnify a group of cells on a slide.
Solute of solution = 17.8 g
Solvn = 198 g
% = 17.8 / 198
w% = 0.089 x 100 = 8.9% by mass
hope this helps!
