Which of the following rules requires that each of the p orbitals at a particular energy level receive one electron before any of them can have two electrons? * a) quantum rule
b) Aufbau principle
c) Hund's rule
d) Pauli exclusion principle

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Rays from the sun are not considered matter true or false