Which experiment showed that the atom has a dense positive center?

a. gold foil experiment
b. vacuum tube experiment
c. oil drop experiment
d. plum pudding experiment

Aballet student who learns with the of his instructor is demonstrating learning.

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2