As you move down group one of the periodic table, what happens to the atomic radii?

What was bohr’s contribution to the planetary model

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion