10 points 1. An atom of a certain element has the atomic number 89 and the mass
of 227 amu. How man neutrons does the atom have? *
a. 89
b. 227
C. 138
O d. 316
2. An atom of Be has four protons, five neutrons and four electrons. What 10 points
is the mas of Be? *

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.