1. by what are isotopes identified? a. mass numbers b. atomic masses c. atomic mass units d. average atomic masses
and
2. uranium atoms each have 92 protons. how many protons does each u-238 atom have? a.92 b.146 c.238 d.330
and
3. chlorine atoms each have 17 protons. how many neutrons does each cl-37 atom have? a.17 b.20 c.37 d.54

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Current from a charged capacitor lights a bulb. as time goes on the brightness of the