Which subatomic particles are found in the
nucleus of an atom of beryllium?
(1) electrons and protons
(2) electrons and positrons
(3) neutrons and protons
(4) neutrons and electrons

The table lists pressure and volume values for a particular gas. which is the best estimate for the value of v at p = 7.0 × 103 pascals?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.