Question

the first model of the atom was developed through
○ scientific experimentation and data analysis with water vapor and gases.
○ observation of the light emitted by elements when they are heated.
○ thinking about the smallest particles of matter without experimenting.
○ analyzing the effects of a magnet on the path of a cathode ray.

Explanation:

The first atomic model (Dalton's) was developed through philosophical and theoretical reasoning about the smallest particles of matter, without experimental evidence initially. The other options: analyzing water vapor/gases (relates to later gas laws/kinetic theory), observing heated elements' light (atomic spectra, later), and cathode ray analysis (discovery of electrons, later) are not how the first model was made. So the correct option is the one about thinking about smallest particles without experimenting.

Answer:

C. thinking about the smallest particles of matter without experimenting.