The two electrons of helium atom are not similar in the a principal quantum number.
b magnetic quantum number.
subsidiary quantum number. a spin quantum number.

In the analysis of hair and fiber samples, which does a compound comparison microscope allow for that a conventional compound microscope does not? a. simultaneous observation b. polarization c. fluorescence d. higher magnification

Explain why scientists use shared characteristics to make cladograms.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line