Beryllium has an atomic number of 4 and an atomic mass of 9. How many neutrons does Beryllium have?

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.