Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Which of the following correctly shows the electron arrangement for sodium?
2,9,1
2,8,2
2,9
2,8,1

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.