Johannes kepler discovered that the orbits of planets are a. parabolic c. elliptical b. circular d. spherical select the best answer from the choices provided a b c d

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

An observation that requires measurement is called quantitative observable or qualitative

The excretory system,need answers for all: )