Câu 28. Khối lượng của electron tính bằng kilogam là A. me = 1,67.10–27. B. me = 1,6.10–19. C. me = 1,67.10–24. D. me = 9,1.10–31

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

How is the composition of a meteorite relevant to finding out the composition of earth's core?

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.